Finding the Fourth Proportional to 31,068.78, 42,875.41 and 16,921.62

Step by Step Solution

1. Step 1: Write the proportion equation
   31,068.78 : 42,875.41 = 16,921.62 : x
2. Step 2: Convert to fraction form
   31,068.78/42,875.41 = 16,921.62/x
3. Step 3: Cross multiply
   31,068.78x = 42,875.41 × 16,921.62
4. Step 4: Simplify right side
   31,068.78x = 725,521,384.79
5. Step 5: Solve for x
   x = 725,521,384.79/31,068.78
6. Step 6: Final answer
   x = 23,352.11