Finding the Fourth Proportional to 1,661.22, 2,292.50 and 915.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,661.22 : 2,292.50 = 915.15 : x
2. Step 2: Convert to fraction form
   1,661.22/2,292.50 = 915.15/x
3. Step 3: Cross multiply
   1,661.22x = 2,292.50 × 915.15
4. Step 4: Simplify right side
   1,661.22x = 2,097,976.80
5. Step 5: Solve for x
   x = 2,097,976.80/1,661.22
6. Step 6: Final answer
   x = 1,262.91