Finding the Fourth Proportional to 2,642.90, 3,964.12 and 1,082.45

Step by Step Solution

1. Step 1: Write the proportion equation
   2,642.90 : 3,964.12 = 1,082.45 : x
2. Step 2: Convert to fraction form
   2,642.90/3,964.12 = 1,082.45/x
3. Step 3: Cross multiply
   2,642.90x = 3,964.12 × 1,082.45
4. Step 4: Simplify right side
   2,642.90x = 4,290,968.90
5. Step 5: Solve for x
   x = 4,290,968.90/2,642.90
6. Step 6: Final answer
   x = 1,623.59