Finding the Fourth Proportional to 12,890.38, 17,788.78 and 7,516

Step by Step Solution

1. Step 1: Write the proportion equation
   12,890.38 : 17,788.78 = 7,516 : x
2. Step 2: Convert to fraction form
   12,890.38/17,788.78 = 7,516/x
3. Step 3: Cross multiply
   12,890.38x = 17,788.78 × 7,516
4. Step 4: Simplify right side
   12,890.38x = 133,700,470.48
5. Step 5: Solve for x
   x = 133,700,470.48/12,890.38
6. Step 6: Final answer
   x = 10,372.11