Finding the Fourth Proportional to 31,068.91, 42,875.14 and 16,921.81

Step by Step Solution

1. Step 1: Write the proportion equation
   31,068.91 : 42,875.14 = 16,921.81 : x
2. Step 2: Convert to fraction form
   31,068.91/42,875.14 = 16,921.81/x
3. Step 3: Cross multiply
   31,068.91x = 42,875.14 × 16,921.81
4. Step 4: Simplify right side
   31,068.91x = 725,524,758.43
5. Step 5: Solve for x
   x = 725,524,758.43/31,068.91
6. Step 6: Final answer
   x = 23,352.12