Finding the Fourth Proportional to 2,642.14, 3,964.27 and 999.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,642.14 : 3,964.27 = 999.15 : x
2. Step 2: Convert to fraction form
   2,642.14/3,964.27 = 999.15/x
3. Step 3: Cross multiply
   2,642.14x = 3,964.27 × 999.15
4. Step 4: Simplify right side
   2,642.14x = 3,960,900.37
5. Step 5: Solve for x
   x = 3,960,900.37/2,642.14
6. Step 6: Final answer
   x = 1,499.13