Finding the Fourth Proportional to 2,105.55, 3,155.72 and 934.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,105.55 : 3,155.72 = 934.20 : x
2. Step 2: Convert to fraction form
   2,105.55/3,155.72 = 934.20/x
3. Step 3: Cross multiply
   2,105.55x = 3,155.72 × 934.20
4. Step 4: Simplify right side
   2,105.55x = 2,948,068.95
5. Step 5: Solve for x
   x = 2,948,068.95/2,105.55
6. Step 6: Final answer
   x = 1,400.14