Finding the Fourth Proportional to 1,296,510,157.98, 1,788,514,485.72 and 878,679,550.62

Step by Step Solution

1. Step 1: Write the proportion equation
   1,296,510,157.98 : 1,788,514,485.72 = 878,679,550.62 : x
2. Step 2: Convert to fraction form
   1,296,510,157.98/1,788,514,485.72 = 878,679,550.62/x
3. Step 3: Cross multiply
   1,296,510,157.98x = 1,788,514,485.72 × 878,679,550.62
4. Step 4: Simplify right side
   1,296,510,157.98x = 1,571,531,104,589,809,920
5. Step 5: Solve for x
   x = 1,571,531,104,589,809,920/1,296,510,157.98
6. Step 6: Final answer
   x = 1,212,124,019.94