Finding the Fourth Proportional to 31,006.72, 42,774.24 and 18,422.56

Step by Step Solution

1. Step 1: Write the proportion equation
   31,006.72 : 42,774.24 = 18,422.56 : x
2. Step 2: Convert to fraction form
   31,006.72/42,774.24 = 18,422.56/x
3. Step 3: Cross multiply
   31,006.72x = 42,774.24 × 18,422.56
4. Step 4: Simplify right side
   31,006.72x = 788,011,002.85
5. Step 5: Solve for x
   x = 788,011,002.85/31,006.72
6. Step 6: Final answer
   x = 25,414.20