Finding the Fourth Proportional to 2,782.86, 4,172.20 and 932.88

Step by Step Solution

1. Step 1: Write the proportion equation
   2,782.86 : 4,172.20 = 932.88 : x
2. Step 2: Convert to fraction form
   2,782.86/4,172.20 = 932.88/x
3. Step 3: Cross multiply
   2,782.86x = 4,172.20 × 932.88
4. Step 4: Simplify right side
   2,782.86x = 3,892,161.94
5. Step 5: Solve for x
   x = 3,892,161.94/2,782.86
6. Step 6: Final answer
   x = 1,398.62