Finding the Fourth Proportional to 2,539.10, 3,808.71 and 807.71

Step by Step Solution

1. Step 1: Write the proportion equation
   2,539.10 : 3,808.71 = 807.71 : x
2. Step 2: Convert to fraction form
   2,539.10/3,808.71 = 807.71/x
3. Step 3: Cross multiply
   2,539.10x = 3,808.71 × 807.71
4. Step 4: Simplify right side
   2,539.10x = 3,076,333.15
5. Step 5: Solve for x
   x = 3,076,333.15/2,539.10
6. Step 6: Final answer
   x = 1,211.58