Finding the Fourth Proportional to 2,642.16, 3,962.43 and 2,120.93

Step by Step Solution

1. Step 1: Write the proportion equation
   2,642.16 : 3,962.43 = 2,120.93 : x
2. Step 2: Convert to fraction form
   2,642.16/3,962.43 = 2,120.93/x
3. Step 3: Cross multiply
   2,642.16x = 3,962.43 × 2,120.93
4. Step 4: Simplify right side
   2,642.16x = 8,404,016.85
5. Step 5: Solve for x
   x = 8,404,016.85/2,642.16
6. Step 6: Final answer
   x = 3,180.74