Finding the Fourth Proportional to 87,665.76, 131,466.33 and 31,490.78

Step by Step Solution

1. Step 1: Write the proportion equation
   87,665.76 : 131,466.33 = 31,490.78 : x
2. Step 2: Convert to fraction form
   87,665.76/131,466.33 = 31,490.78/x
3. Step 3: Cross multiply
   87,665.76x = 131,466.33 × 31,490.78
4. Step 4: Simplify right side
   87,665.76x = 4,139,976,618.11
5. Step 5: Solve for x
   x = 4,139,976,618.11/87,665.76
6. Step 6: Final answer
   x = 47,224.56