Finding the Fourth Proportional to 31,325.29, 42,989.22 and 31,103.87

Step by Step Solution

1. Step 1: Write the proportion equation
   31,325.29 : 42,989.22 = 31,103.87 : x
2. Step 2: Convert to fraction form
   31,325.29/42,989.22 = 31,103.87/x
3. Step 3: Cross multiply
   31,325.29x = 42,989.22 × 31,103.87
4. Step 4: Simplify right side
   31,325.29x = 1,337,130,895.34
5. Step 5: Solve for x
   x = 1,337,130,895.34/31,325.29
6. Step 6: Final answer
   x = 42,685.35