Finding the Fourth Proportional to 31,328.54, 42,993.67 and 31,107.12

Step by Step Solution

1. Step 1: Write the proportion equation
   31,328.54 : 42,993.67 = 31,107.12 : x
2. Step 2: Convert to fraction form
   31,328.54/42,993.67 = 31,107.12/x
3. Step 3: Cross multiply
   31,328.54x = 42,993.67 × 31,107.12
4. Step 4: Simplify right side
   31,328.54x = 1,337,409,251.93
5. Step 5: Solve for x
   x = 1,337,409,251.93/31,328.54
6. Step 6: Final answer
   x = 42,689.80