Finding the Fourth Proportional to 1,659.72, 2,290.24 and 913.60

Step by Step Solution

1. Step 1: Write the proportion equation
   1,659.72 : 2,290.24 = 913.60 : x
2. Step 2: Convert to fraction form
   1,659.72/2,290.24 = 913.60/x
3. Step 3: Cross multiply
   1,659.72x = 2,290.24 × 913.60
4. Step 4: Simplify right side
   1,659.72x = 2,092,363.26
5. Step 5: Solve for x
   x = 2,092,363.26/1,659.72
6. Step 6: Final answer
   x = 1,260.67