Finding the Fourth Proportional to 31,002.72, 42,784.16 and 16,855.52

Step by Step Solution

1. Step 1: Write the proportion equation
   31,002.72 : 42,784.16 = 16,855.52 : x
2. Step 2: Convert to fraction form
   31,002.72/42,784.16 = 16,855.52/x
3. Step 3: Cross multiply
   31,002.72x = 42,784.16 × 16,855.52
4. Step 4: Simplify right side
   31,002.72x = 721,149,264.56
5. Step 5: Solve for x
   x = 721,149,264.56/31,002.72
6. Step 6: Final answer
   x = 23,260.84