Finding the Fourth Proportional to 2,085.28, 2,877.12 and 1,245.61

Step by Step Solution

1. Step 1: Write the proportion equation
   2,085.28 : 2,877.12 = 1,245.61 : x
2. Step 2: Convert to fraction form
   2,085.28/2,877.12 = 1,245.61/x
3. Step 3: Cross multiply
   2,085.28x = 2,877.12 × 1,245.61
4. Step 4: Simplify right side
   2,085.28x = 3,583,773.04
5. Step 5: Solve for x
   x = 3,583,773.04/2,085.28
6. Step 6: Final answer
   x = 1,718.61