Finding the Fourth Proportional to 90,308.71, 135,469.55 and 31,143.52

Step by Step Solution

1. Step 1: Write the proportion equation
   90,308.71 : 135,469.55 = 31,143.52 : x
2. Step 2: Convert to fraction form
   90,308.71/135,469.55 = 31,143.52/x
3. Step 3: Cross multiply
   90,308.71x = 135,469.55 × 31,143.52
4. Step 4: Simplify right side
   90,308.71x = 4,218,997,806.75
5. Step 5: Solve for x
   x = 4,218,997,806.75/90,308.71
6. Step 6: Final answer
   x = 46,717.51