Finding the Fourth Proportional to 31,012.18, 42,797.10 and 18,434.50

Step by Step Solution

1. Step 1: Write the proportion equation
   31,012.18 : 42,797.10 = 18,434.50 : x
2. Step 2: Convert to fraction form
   31,012.18/42,797.10 = 18,434.50/x
3. Step 3: Cross multiply
   31,012.18x = 42,797.10 × 18,434.50
4. Step 4: Simplify right side
   31,012.18x = 788,943,139.95
5. Step 5: Solve for x
   x = 788,943,139.95/31,012.18
6. Step 6: Final answer
   x = 25,439.78