Finding the Fourth Proportional to 2,642.67, 3,964.86 and 999.36

Step by Step Solution

1. Step 1: Write the proportion equation
   2,642.67 : 3,964.86 = 999.36 : x
2. Step 2: Convert to fraction form
   2,642.67/3,964.86 = 999.36/x
3. Step 3: Cross multiply
   2,642.67x = 3,964.86 × 999.36
4. Step 4: Simplify right side
   2,642.67x = 3,962,322.49
5. Step 5: Solve for x
   x = 3,962,322.49/2,642.67
6. Step 6: Final answer
   x = 1,499.36