Finding the Fourth Proportional to 1,641.16, 2,462.72 and 667.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,641.16 : 2,462.72 = 667.20 : x
2. Step 2: Convert to fraction form
   1,641.16/2,462.72 = 667.20/x
3. Step 3: Cross multiply
   1,641.16x = 2,462.72 × 667.20
4. Step 4: Simplify right side
   1,641.16x = 1,643,126.78
5. Step 5: Solve for x
   x = 1,643,126.78/1,641.16
6. Step 6: Final answer
   x = 1,001.20