Finding the Fourth Proportional to 2,407.78, 3,612.30 and 847.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,407.78 : 3,612.30 = 847.72 : x
2. Step 2: Convert to fraction form
   2,407.78/3,612.30 = 847.72/x
3. Step 3: Cross multiply
   2,407.78x = 3,612.30 × 847.72
4. Step 4: Simplify right side
   2,407.78x = 3,062,218.96
5. Step 5: Solve for x
   x = 3,062,218.96/2,407.78
6. Step 6: Final answer
   x = 1,271.80