Finding the Fourth Proportional to 31,037.58, 42,831.72 and 16,890.12

Step by Step Solution

1. Step 1: Write the proportion equation
   31,037.58 : 42,831.72 = 16,890.12 : x
2. Step 2: Convert to fraction form
   31,037.58/42,831.72 = 16,890.12/x
3. Step 3: Cross multiply
   31,037.58x = 42,831.72 × 16,890.12
4. Step 4: Simplify right side
   31,037.58x = 723,432,890.61
5. Step 5: Solve for x
   x = 723,432,890.61/31,037.58
6. Step 6: Final answer
   x = 23,308.29