Finding the Fourth Proportional to 1,388.26, 2,066.04 and 1,336.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,388.26 : 2,066.04 = 1,336.42 : x
2. Step 2: Convert to fraction form
   1,388.26/2,066.04 = 1,336.42/x
3. Step 3: Cross multiply
   1,388.26x = 2,066.04 × 1,336.42
4. Step 4: Simplify right side
   1,388.26x = 2,761,097.18
5. Step 5: Solve for x
   x = 2,761,097.18/1,388.26
6. Step 6: Final answer
   x = 1,988.89