Finding the Fourth Proportional to 31,050.52, 42,899.82 and 21,661

Step by Step Solution

1. Step 1: Write the proportion equation
   31,050.52 : 42,899.82 = 21,661 : x
2. Step 2: Convert to fraction form
   31,050.52/42,899.82 = 21,661/x
3. Step 3: Cross multiply
   31,050.52x = 42,899.82 × 21,661
4. Step 4: Simplify right side
   31,050.52x = 929,253,001.02
5. Step 5: Solve for x
   x = 929,253,001.02/31,050.52
6. Step 6: Final answer
   x = 29,927.13