Finding the Fourth Proportional to 2,614.16, 3,921.30 and 666.38

Step by Step Solution

1. Step 1: Write the proportion equation
   2,614.16 : 3,921.30 = 666.38 : x
2. Step 2: Convert to fraction form
   2,614.16/3,921.30 = 666.38/x
3. Step 3: Cross multiply
   2,614.16x = 3,921.30 × 666.38
4. Step 4: Simplify right side
   2,614.16x = 2,613,075.89
5. Step 5: Solve for x
   x = 2,613,075.89/2,614.16
6. Step 6: Final answer
   x = 999.59