Finding the Fourth Proportional to 1,640.72, 2,264.26 and 932.60

Step by Step Solution

1. Step 1: Write the proportion equation
   1,640.72 : 2,264.26 = 932.60 : x
2. Step 2: Convert to fraction form
   1,640.72/2,264.26 = 932.60/x
3. Step 3: Cross multiply
   1,640.72x = 2,264.26 × 932.60
4. Step 4: Simplify right side
   1,640.72x = 2,111,641.31
5. Step 5: Solve for x
   x = 2,111,641.31/1,640.72
6. Step 6: Final answer
   x = 1,287.02