Finding the Fourth Proportional to 31,165.30, 42,997.98 and 18,418.86

Step by Step Solution

1. Step 1: Write the proportion equation
   31,165.30 : 42,997.98 = 18,418.86 : x
2. Step 2: Convert to fraction form
   31,165.30/42,997.98 = 18,418.86/x
3. Step 3: Cross multiply
   31,165.30x = 42,997.98 × 18,418.86
4. Step 4: Simplify right side
   31,165.30x = 791,973,773.90
5. Step 5: Solve for x
   x = 791,973,773.90/31,165.30
6. Step 6: Final answer
   x = 25,412.04