Finding the Fourth Proportional to 31,327.54, 42,992.30 and 31,106.12

Step by Step Solution

1. Step 1: Write the proportion equation
   31,327.54 : 42,992.30 = 31,106.12 : x
2. Step 2: Convert to fraction form
   31,327.54/42,992.30 = 31,106.12/x
3. Step 3: Cross multiply
   31,327.54x = 42,992.30 × 31,106.12
4. Step 4: Simplify right side
   31,327.54x = 1,337,323,505.68
5. Step 5: Solve for x
   x = 1,337,323,505.68/31,327.54
6. Step 6: Final answer
   x = 42,688.43