Finding the Fourth Proportional to 90,031.50, 124,243.50 and 50,287.50

Step by Step Solution

1. Step 1: Write the proportion equation
   90,031.50 : 124,243.50 = 50,287.50 : x
2. Step 2: Convert to fraction form
   90,031.50/124,243.50 = 50,287.50/x
3. Step 3: Cross multiply
   90,031.50x = 124,243.50 × 50,287.50
4. Step 4: Simplify right side
   90,031.50x = 6,247,895,006.25
5. Step 5: Solve for x
   x = 6,247,895,006.25/90,031.50
6. Step 6: Final answer
   x = 69,396.77