Finding the Fourth Proportional to 31,005.79, 42,787.76 and 16,858.62

Step by Step Solution

1. Step 1: Write the proportion equation
   31,005.79 : 42,787.76 = 16,858.62 : x
2. Step 2: Convert to fraction form
   31,005.79/42,787.76 = 16,858.62/x
3. Step 3: Cross multiply
   31,005.79x = 42,787.76 × 16,858.62
4. Step 4: Simplify right side
   31,005.79x = 721,342,502.20
5. Step 5: Solve for x
   x = 721,342,502.20/31,005.79
6. Step 6: Final answer
   x = 23,264.77