Finding the Fourth Proportional to 2,451.31, 3,677.20 and 807.86

Step by Step Solution

1. Step 1: Write the proportion equation
   2,451.31 : 3,677.20 = 807.86 : x
2. Step 2: Convert to fraction form
   2,451.31/3,677.20 = 807.86/x
3. Step 3: Cross multiply
   2,451.31x = 3,677.20 × 807.86
4. Step 4: Simplify right side
   2,451.31x = 2,970,662.79
5. Step 5: Solve for x
   x = 2,970,662.79/2,451.31
6. Step 6: Final answer
   x = 1,211.87