Finding the Fourth Proportional to 2,642.91, 3,964.23 and 887.94

Step by Step Solution

1. Step 1: Write the proportion equation
   2,642.91 : 3,964.23 = 887.94 : x
2. Step 2: Convert to fraction form
   2,642.91/3,964.23 = 887.94/x
3. Step 3: Cross multiply
   2,642.91x = 3,964.23 × 887.94
4. Step 4: Simplify right side
   2,642.91x = 3,519,998.39
5. Step 5: Solve for x
   x = 3,519,998.39/2,642.91
6. Step 6: Final answer
   x = 1,331.86