Finding the Fourth Proportional to 2,105.55, 3,158.33 and 807.93

Step by Step Solution

1. Step 1: Write the proportion equation
   2,105.55 : 3,158.33 = 807.93 : x
2. Step 2: Convert to fraction form
   2,105.55/3,158.33 = 807.93/x
3. Step 3: Cross multiply
   2,105.55x = 3,158.33 × 807.93
4. Step 4: Simplify right side
   2,105.55x = 2,551,705.52
5. Step 5: Solve for x
   x = 2,551,705.52/2,105.55
6. Step 6: Final answer
   x = 1,211.90