Finding the Fourth Proportional to 1,398.49, 2,088.79 and 1,266.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,398.49 : 2,088.79 = 1,266.52 : x
2. Step 2: Convert to fraction form
   1,398.49/2,088.79 = 1,266.52/x
3. Step 3: Cross multiply
   1,398.49x = 2,088.79 × 1,266.52
4. Step 4: Simplify right side
   1,398.49x = 2,645,494.31
5. Step 5: Solve for x
   x = 2,645,494.31/1,398.49
6. Step 6: Final answer
   x = 1,891.68