Finding the Fourth Proportional to 2,085.21, 2,877.16 and 1,245.61

Step by Step Solution

1. Step 1: Write the proportion equation
   2,085.21 : 2,877.16 = 1,245.61 : x
2. Step 2: Convert to fraction form
   2,085.21/2,877.16 = 1,245.61/x
3. Step 3: Cross multiply
   2,085.21x = 2,877.16 × 1,245.61
4. Step 4: Simplify right side
   2,085.21x = 3,583,805.90
5. Step 5: Solve for x
   x = 3,583,805.90/2,085.21
6. Step 6: Final answer
   x = 1,718.68