Finding the Fourth Proportional to 31,005.40, 42,793.62 and 18,427.72

Step by Step Solution

1. Step 1: Write the proportion equation
   31,005.40 : 42,793.62 = 18,427.72 : x
2. Step 2: Convert to fraction form
   31,005.40/42,793.62 = 18,427.72/x
3. Step 3: Cross multiply
   31,005.40x = 42,793.62 × 18,427.72
4. Step 4: Simplify right side
   31,005.40x = 788,588,847.15
5. Step 5: Solve for x
   x = 788,588,847.15/31,005.40
6. Step 6: Final answer
   x = 25,433.92