Finding the Fourth Proportional to 1,661.15, 2,292.37 and 915.09

Step by Step Solution

1. Step 1: Write the proportion equation
   1,661.15 : 2,292.37 = 915.09 : x
2. Step 2: Convert to fraction form
   1,661.15/2,292.37 = 915.09/x
3. Step 3: Cross multiply
   1,661.15x = 2,292.37 × 915.09
4. Step 4: Simplify right side
   1,661.15x = 2,097,730.10
5. Step 5: Solve for x
   x = 2,097,730.10/1,661.15
6. Step 6: Final answer
   x = 1,262.82