Finding the Fourth Proportional to 1,151.90, 1,728.72 and 713.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,151.90 : 1,728.72 = 713.48 : x
2. Step 2: Convert to fraction form
   1,151.90/1,728.72 = 713.48/x
3. Step 3: Cross multiply
   1,151.90x = 1,728.72 × 713.48
4. Step 4: Simplify right side
   1,151.90x = 1,233,407.15
5. Step 5: Solve for x
   x = 1,233,407.15/1,151.90
6. Step 6: Final answer
   x = 1,070.76