Finding the Fourth Proportional to 1,507.52, 2,080.61 and 878.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,507.52 : 2,080.61 = 878.05 : x
2. Step 2: Convert to fraction form
   1,507.52/2,080.61 = 878.05/x
3. Step 3: Cross multiply
   1,507.52x = 2,080.61 × 878.05
4. Step 4: Simplify right side
   1,507.52x = 1,826,879.61
5. Step 5: Solve for x
   x = 1,826,879.61/1,507.52
6. Step 6: Final answer
   x = 1,211.84