Finding the Fourth Proportional to 1,080.42, 1,491.48 and 707.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,080.42 : 1,491.48 = 707.82 : x
2. Step 2: Convert to fraction form
   1,080.42/1,491.48 = 707.82/x
3. Step 3: Cross multiply
   1,080.42x = 1,491.48 × 707.82
4. Step 4: Simplify right side
   1,080.42x = 1,055,699.37
5. Step 5: Solve for x
   x = 1,055,699.37/1,080.42
6. Step 6: Final answer
   x = 977.12