Finding the Fourth Proportional to 13,354.59, 18,430.71 and 7,689.57

Step by Step Solution

1. Step 1: Write the proportion equation
   13,354.59 : 18,430.71 = 7,689.57 : x
2. Step 2: Convert to fraction form
   13,354.59/18,430.71 = 7,689.57/x
3. Step 3: Cross multiply
   13,354.59x = 18,430.71 × 7,689.57
4. Step 4: Simplify right side
   13,354.59x = 141,724,234.69
5. Step 5: Solve for x
   x = 141,724,234.69/13,354.59
6. Step 6: Final answer
   x = 10,612.40