Finding the Fourth Proportional to 10,387.86, 14,350.41 and 8,988.18

Step by Step Solution

1. Step 1: Write the proportion equation
   10,387.86 : 14,350.41 = 8,988.18 : x
2. Step 2: Convert to fraction form
   10,387.86/14,350.41 = 8,988.18/x
3. Step 3: Cross multiply
   10,387.86x = 14,350.41 × 8,988.18
4. Step 4: Simplify right side
   10,387.86x = 128,984,068.15
5. Step 5: Solve for x
   x = 128,984,068.15/10,387.86
6. Step 6: Final answer
   x = 12,416.81