Finding the Fourth Proportional to 31,218.72, 43,078.56 and 17,787.18

Step by Step Solution

1. Step 1: Write the proportion equation
   31,218.72 : 43,078.56 = 17,787.18 : x
2. Step 2: Convert to fraction form
   31,218.72/43,078.56 = 17,787.18/x
3. Step 3: Cross multiply
   31,218.72x = 43,078.56 × 17,787.18
4. Step 4: Simplify right side
   31,218.72x = 766,246,100.86
5. Step 5: Solve for x
   x = 766,246,100.86/31,218.72
6. Step 6: Final answer
   x = 24,544.44