Finding the Fourth Proportional to 31,004.40, 42,792.24 and 18,426.72

Step by Step Solution

1. Step 1: Write the proportion equation
   31,004.40 : 42,792.24 = 18,426.72 : x
2. Step 2: Convert to fraction form
   31,004.40/42,792.24 = 18,426.72/x
3. Step 3: Cross multiply
   31,004.40x = 42,792.24 × 18,426.72
4. Step 4: Simplify right side
   31,004.40x = 788,520,624.65
5. Step 5: Solve for x
   x = 788,520,624.65/31,004.40
6. Step 6: Final answer
   x = 25,432.54