Finding the Fourth Proportional to 1,661.16, 2,292.48 and 915.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,661.16 : 2,292.48 = 915.18 : x
2. Step 2: Convert to fraction form
   1,661.16/2,292.48 = 915.18/x
3. Step 3: Cross multiply
   1,661.16x = 2,292.48 × 915.18
4. Step 4: Simplify right side
   1,661.16x = 2,098,031.85
5. Step 5: Solve for x
   x = 2,098,031.85/1,661.16
6. Step 6: Final answer
   x = 1,262.99