Finding the Fourth Proportional to 31,047.52, 42,895.68 and 21,658

Step by Step Solution

1. Step 1: Write the proportion equation
   31,047.52 : 42,895.68 = 21,658 : x
2. Step 2: Convert to fraction form
   31,047.52/42,895.68 = 21,658/x
3. Step 3: Cross multiply
   31,047.52x = 42,895.68 × 21,658
4. Step 4: Simplify right side
   31,047.52x = 929,034,637.44
5. Step 5: Solve for x
   x = 929,034,637.44/31,047.52
6. Step 6: Final answer
   x = 29,922.99