Finding the Fourth Proportional to 1,507.48, 2,080.42 and 878.06

Step by Step Solution

1. Step 1: Write the proportion equation
   1,507.48 : 2,080.42 = 878.06 : x
2. Step 2: Convert to fraction form
   1,507.48/2,080.42 = 878.06/x
3. Step 3: Cross multiply
   1,507.48x = 2,080.42 × 878.06
4. Step 4: Simplify right side
   1,507.48x = 1,826,733.59
5. Step 5: Solve for x
   x = 1,826,733.59/1,507.48
6. Step 6: Final answer
   x = 1,211.78