Finding the Fourth Proportional to 2,642.01, 3,964.22 and 999.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,642.01 : 3,964.22 = 999.12 : x
2. Step 2: Convert to fraction form
   2,642.01/3,964.22 = 999.12/x
3. Step 3: Cross multiply
   2,642.01x = 3,964.22 × 999.12
4. Step 4: Simplify right side
   2,642.01x = 3,960,731.49
5. Step 5: Solve for x
   x = 3,960,731.49/2,642.01
6. Step 6: Final answer
   x = 1,499.14