Finding the Fourth Proportional to 1,145.52, 1,719.18 and 872.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,145.52 : 1,719.18 = 872.28 : x
2. Step 2: Convert to fraction form
   1,145.52/1,719.18 = 872.28/x
3. Step 3: Cross multiply
   1,145.52x = 1,719.18 × 872.28
4. Step 4: Simplify right side
   1,145.52x = 1,499,606.33
5. Step 5: Solve for x
   x = 1,499,606.33/1,145.52
6. Step 6: Final answer
   x = 1,309.11