Finding the Fourth Proportional to 1,399.96, 2,088.59 and 1,274.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,399.96 : 2,088.59 = 1,274.20 : x
2. Step 2: Convert to fraction form
   1,399.96/2,088.59 = 1,274.20/x
3. Step 3: Cross multiply
   1,399.96x = 2,088.59 × 1,274.20
4. Step 4: Simplify right side
   1,399.96x = 2,661,281.38
5. Step 5: Solve for x
   x = 2,661,281.38/1,399.96
6. Step 6: Final answer
   x = 1,900.97