Finding the Fourth Proportional to 2,781.19, 4,172.45 and 932.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,781.19 : 4,172.45 = 932.31 : x
2. Step 2: Convert to fraction form
   2,781.19/4,172.45 = 932.31/x
3. Step 3: Cross multiply
   2,781.19x = 4,172.45 × 932.31
4. Step 4: Simplify right side
   2,781.19x = 3,890,016.86
5. Step 5: Solve for x
   x = 3,890,016.86/2,781.19
6. Step 6: Final answer
   x = 1,398.69