Finding the Fourth Proportional to 78,639,257.37, 117,958,784.00 and 21,131,529.83

Step by Step Solution

1. Step 1: Write the proportion equation
   78,639,257.37 : 117,958,784.00 = 21,131,529.83 : x
2. Step 2: Convert to fraction form
   78,639,257.37/117,958,784.00 = 21,131,529.83/x
3. Step 3: Cross multiply
   78,639,257.37x = 117,958,784.00 × 21,131,529.83
4. Step 4: Simplify right side
   78,639,257.37x = 2,492,649,562,111,075
5. Step 5: Solve for x
   x = 2,492,649,562,111,075/78,639,257.37
6. Step 6: Final answer
   x = 31,697,267.31