Finding the Fourth Proportional to 90,789.71, 136,185.17 and 31,626.50

Step by Step Solution

1. Step 1: Write the proportion equation
   90,789.71 : 136,185.17 = 31,626.50 : x
2. Step 2: Convert to fraction form
   90,789.71/136,185.17 = 31,626.50/x
3. Step 3: Cross multiply
   90,789.71x = 136,185.17 × 31,626.50
4. Step 4: Simplify right side
   90,789.71x = 4,307,059,439.95
5. Step 5: Solve for x
   x = 4,307,059,439.95/90,789.71
6. Step 6: Final answer
   x = 47,439.95