Finding the Fourth Proportional to 31,138.12, 42,971.55 and 17,711.31

Step by Step Solution

1. Step 1: Write the proportion equation
   31,138.12 : 42,971.55 = 17,711.31 : x
2. Step 2: Convert to fraction form
   31,138.12/42,971.55 = 17,711.31/x
3. Step 3: Cross multiply
   31,138.12x = 42,971.55 × 17,711.31
4. Step 4: Simplify right side
   31,138.12x = 761,082,443.23
5. Step 5: Solve for x
   x = 761,082,443.23/31,138.12
6. Step 6: Final answer
   x = 24,442.14