Finding the Fourth Proportional to 2,715.80, 4,070.55 and 1,255.10

Step by Step Solution

1. Step 1: Write the proportion equation
   2,715.80 : 4,070.55 = 1,255.10 : x
2. Step 2: Convert to fraction form
   2,715.80/4,070.55 = 1,255.10/x
3. Step 3: Cross multiply
   2,715.80x = 4,070.55 × 1,255.10
4. Step 4: Simplify right side
   2,715.80x = 5,108,947.31
5. Step 5: Solve for x
   x = 5,108,947.31/2,715.80
6. Step 6: Final answer
   x = 1,881.19