Finding the Fourth Proportional to 1,338.10, 2,006.52 and 868.81

Step by Step Solution

1. Step 1: Write the proportion equation
   1,338.10 : 2,006.52 = 868.81 : x
2. Step 2: Convert to fraction form
   1,338.10/2,006.52 = 868.81/x
3. Step 3: Cross multiply
   1,338.10x = 2,006.52 × 868.81
4. Step 4: Simplify right side
   1,338.10x = 1,743,284.64
5. Step 5: Solve for x
   x = 1,743,284.64/1,338.10
6. Step 6: Final answer
   x = 1,302.81