Finding the Fourth Proportional to 31,012.77, 42,797.92 and 18,435.09

Step by Step Solution

1. Step 1: Write the proportion equation
   31,012.77 : 42,797.92 = 18,435.09 : x
2. Step 2: Convert to fraction form
   31,012.77/42,797.92 = 18,435.09/x
3. Step 3: Cross multiply
   31,012.77x = 42,797.92 × 18,435.09
4. Step 4: Simplify right side
   31,012.77x = 788,983,655.98
5. Step 5: Solve for x
   x = 788,983,655.98/31,012.77
6. Step 6: Final answer
   x = 25,440.60