Finding the Fourth Proportional to 31,038.66, 42,833.61 and 16,891.47

Step by Step Solution

1. Step 1: Write the proportion equation
   31,038.66 : 42,833.61 = 16,891.47 : x
2. Step 2: Convert to fraction form
   31,038.66/42,833.61 = 16,891.47/x
3. Step 3: Cross multiply
   31,038.66x = 42,833.61 × 16,891.47
4. Step 4: Simplify right side
   31,038.66x = 723,522,638.31
5. Step 5: Solve for x
   x = 723,522,638.31/31,038.66
6. Step 6: Final answer
   x = 23,310.37