Finding the Fourth Proportional to 1,080.72, 1,491.40 and 614.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,080.72 : 1,491.40 = 614.96 : x
2. Step 2: Convert to fraction form
   1,080.72/1,491.40 = 614.96/x
3. Step 3: Cross multiply
   1,080.72x = 1,491.40 × 614.96
4. Step 4: Simplify right side
   1,080.72x = 917,151.34
5. Step 5: Solve for x
   x = 917,151.34/1,080.72
6. Step 6: Final answer
   x = 848.65