Finding the Fourth Proportional to 1,080.55, 1,490.79 and 707.95

Step by Step Solution

1. Step 1: Write the proportion equation
   1,080.55 : 1,490.79 = 707.95 : x
2. Step 2: Convert to fraction form
   1,080.55/1,490.79 = 707.95/x
3. Step 3: Cross multiply
   1,080.55x = 1,490.79 × 707.95
4. Step 4: Simplify right side
   1,080.55x = 1,055,404.78
5. Step 5: Solve for x
   x = 1,055,404.78/1,080.55
6. Step 6: Final answer
   x = 976.73