Finding the Fourth Proportional to 1,145.48, 1,581.30 and 731.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,145.48 : 1,581.30 = 731.72 : x
2. Step 2: Convert to fraction form
   1,145.48/1,581.30 = 731.72/x
3. Step 3: Cross multiply
   1,145.48x = 1,581.30 × 731.72
4. Step 4: Simplify right side
   1,145.48x = 1,157,068.84
5. Step 5: Solve for x
   x = 1,157,068.84/1,145.48
6. Step 6: Final answer
   x = 1,010.12