Finding the Fourth Proportional to 1,080.80, 1,490.71 and 707.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,080.80 : 1,490.71 = 707.18 : x
2. Step 2: Convert to fraction form
   1,080.80/1,490.71 = 707.18/x
3. Step 3: Cross multiply
   1,080.80x = 1,490.71 × 707.18
4. Step 4: Simplify right side
   1,080.80x = 1,054,200.30
5. Step 5: Solve for x
   x = 1,054,200.30/1,080.80
6. Step 6: Final answer
   x = 975.39