Finding the Fourth Proportional to 2,781.89, 4,172.72 and 932.87

Step by Step Solution

1. Step 1: Write the proportion equation
   2,781.89 : 4,172.72 = 932.87 : x
2. Step 2: Convert to fraction form
   2,781.89/4,172.72 = 932.87/x
3. Step 3: Cross multiply
   2,781.89x = 4,172.72 × 932.87
4. Step 4: Simplify right side
   2,781.89x = 3,892,587.60
5. Step 5: Solve for x
   x = 3,892,587.60/2,781.89
6. Step 6: Final answer
   x = 1,399.26