Finding the Fourth Proportional to 1,760.16, 2,640.72 and 664.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,760.16 : 2,640.72 = 664.86 : x
2. Step 2: Convert to fraction form
   1,760.16/2,640.72 = 664.86/x
3. Step 3: Cross multiply
   1,760.16x = 2,640.72 × 664.86
4. Step 4: Simplify right side
   1,760.16x = 1,755,709.10
5. Step 5: Solve for x
   x = 1,755,709.10/1,760.16
6. Step 6: Final answer
   x = 997.47