Finding the Fourth Proportional to 1,080.76, 1,493.40 and 870.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,080.76 : 1,493.40 = 870.52 : x
2. Step 2: Convert to fraction form
   1,080.76/1,493.40 = 870.52/x
3. Step 3: Cross multiply
   1,080.76x = 1,493.40 × 870.52
4. Step 4: Simplify right side
   1,080.76x = 1,300,034.57
5. Step 5: Solve for x
   x = 1,300,034.57/1,080.76
6. Step 6: Final answer
   x = 1,202.89