Finding the Fourth Proportional to 2,085.18, 2,877.78 and 1,560.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,085.18 : 2,877.78 = 1,560.30 : x
2. Step 2: Convert to fraction form
   2,085.18/2,877.78 = 1,560.30/x
3. Step 3: Cross multiply
   2,085.18x = 2,877.78 × 1,560.30
4. Step 4: Simplify right side
   2,085.18x = 4,490,200.13
5. Step 5: Solve for x
   x = 4,490,200.13/2,085.18
6. Step 6: Final answer
   x = 2,153.39