Finding the Fourth Proportional to 31,119.12, 42,932.16 and 19,161.72

Step by Step Solution

1. Step 1: Write the proportion equation
   31,119.12 : 42,932.16 = 19,161.72 : x
2. Step 2: Convert to fraction form
   31,119.12/42,932.16 = 19,161.72/x
3. Step 3: Cross multiply
   31,119.12x = 42,932.16 × 19,161.72
4. Step 4: Simplify right side
   31,119.12x = 822,654,028.92
5. Step 5: Solve for x
   x = 822,654,028.92/31,119.12
6. Step 6: Final answer
   x = 26,435.65