Finding the Fourth Proportional to 31,008.40, 42,797.76 and 18,430.72

Step by Step Solution

1. Step 1: Write the proportion equation
   31,008.40 : 42,797.76 = 18,430.72 : x
2. Step 2: Convert to fraction form
   31,008.40/42,797.76 = 18,430.72/x
3. Step 3: Cross multiply
   31,008.40x = 42,797.76 × 18,430.72
4. Step 4: Simplify right side
   31,008.40x = 788,793,531.19
5. Step 5: Solve for x
   x = 788,793,531.19/31,008.40
6. Step 6: Final answer
   x = 25,438.06