Finding the Fourth Proportional to 31,043.52, 42,890.16 and 21,654

Step by Step Solution

1. Step 1: Write the proportion equation
   31,043.52 : 42,890.16 = 21,654 : x
2. Step 2: Convert to fraction form
   31,043.52/42,890.16 = 21,654/x
3. Step 3: Cross multiply
   31,043.52x = 42,890.16 × 21,654
4. Step 4: Simplify right side
   31,043.52x = 928,743,524.64
5. Step 5: Solve for x
   x = 928,743,524.64/31,043.52
6. Step 6: Final answer
   x = 29,917.47