Finding the Fourth Proportional to 2,399.16, 3,598.20 and 667.80

Step by Step Solution

1. Step 1: Write the proportion equation
   2,399.16 : 3,598.20 = 667.80 : x
2. Step 2: Convert to fraction form
   2,399.16/3,598.20 = 667.80/x
3. Step 3: Cross multiply
   2,399.16x = 3,598.20 × 667.80
4. Step 4: Simplify right side
   2,399.16x = 2,402,877.96
5. Step 5: Solve for x
   x = 2,402,877.96/2,399.16
6. Step 6: Final answer
   x = 1,001.55