Finding the Fourth Proportional to 2,105.56, 3,158.88 and 807.04

Step by Step Solution

1. Step 1: Write the proportion equation
   2,105.56 : 3,158.88 = 807.04 : x
2. Step 2: Convert to fraction form
   2,105.56/3,158.88 = 807.04/x
3. Step 3: Cross multiply
   2,105.56x = 3,158.88 × 807.04
4. Step 4: Simplify right side
   2,105.56x = 2,549,342.52
5. Step 5: Solve for x
   x = 2,549,342.52/2,105.56
6. Step 6: Final answer
   x = 1,210.77