Finding the Fourth Proportional to 13,447,111.68, 18,558,568.80 and 7,487,118.72

Step by Step Solution

1. Step 1: Write the proportion equation
   13,447,111.68 : 18,558,568.80 = 7,487,118.72 : x
2. Step 2: Convert to fraction form
   13,447,111.68/18,558,568.80 = 7,487,118.72/x
3. Step 3: Cross multiply
   13,447,111.68x = 18,558,568.80 × 7,487,118.72
4. Step 4: Simplify right side
   13,447,111.68x = 138,950,207,878,887.94
5. Step 5: Solve for x
   x = 138,950,207,878,887.94/13,447,111.68
6. Step 6: Final answer
   x = 10,333,089.45