Finding the Fourth Proportional to 31,046.52, 42,894.30 and 21,657

Step by Step Solution

1. Step 1: Write the proportion equation
   31,046.52 : 42,894.30 = 21,657 : x
2. Step 2: Convert to fraction form
   31,046.52/42,894.30 = 21,657/x
3. Step 3: Cross multiply
   31,046.52x = 42,894.30 × 21,657
4. Step 4: Simplify right side
   31,046.52x = 928,961,855.10
5. Step 5: Solve for x
   x = 928,961,855.10/31,046.52
6. Step 6: Final answer
   x = 29,921.61