Finding the Fourth Proportional to 1,662.06, 2,293.56 and 915.90

Step by Step Solution

1. Step 1: Write the proportion equation
   1,662.06 : 2,293.56 = 915.90 : x
2. Step 2: Convert to fraction form
   1,662.06/2,293.56 = 915.90/x
3. Step 3: Cross multiply
   1,662.06x = 2,293.56 × 915.90
4. Step 4: Simplify right side
   1,662.06x = 2,100,671.60
5. Step 5: Solve for x
   x = 2,100,671.60/1,662.06
6. Step 6: Final answer
   x = 1,263.90