Finding the Fourth Proportional to 31,037.50, 42,831.75 and 16,890.45

Step by Step Solution

1. Step 1: Write the proportion equation
   31,037.50 : 42,831.75 = 16,890.45 : x
2. Step 2: Convert to fraction form
   31,037.50/42,831.75 = 16,890.45/x
3. Step 3: Cross multiply
   31,037.50x = 42,831.75 × 16,890.45
4. Step 4: Simplify right side
   31,037.50x = 723,447,531.79
5. Step 5: Solve for x
   x = 723,447,531.79/31,037.50
6. Step 6: Final answer
   x = 23,308.82