Finding the Fourth Proportional to 2,538.57, 3,808.46 and 807.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,538.57 : 3,808.46 = 807.20 : x
2. Step 2: Convert to fraction form
   2,538.57/3,808.46 = 807.20/x
3. Step 3: Cross multiply
   2,538.57x = 3,808.46 × 807.20
4. Step 4: Simplify right side
   2,538.57x = 3,074,165.83
5. Step 5: Solve for x
   x = 3,074,165.83/2,538.57
6. Step 6: Final answer
   x = 1,210.98