Finding the Fourth Proportional to 1,641.18, 2,461.86 and 667.16

Step by Step Solution

1. Step 1: Write the proportion equation
   1,641.18 : 2,461.86 = 667.16 : x
2. Step 2: Convert to fraction form
   1,641.18/2,461.86 = 667.16/x
3. Step 3: Cross multiply
   1,641.18x = 2,461.86 × 667.16
4. Step 4: Simplify right side
   1,641.18x = 1,642,454.52
5. Step 5: Solve for x
   x = 1,642,454.52/1,641.18
6. Step 6: Final answer
   x = 1,000.78