Finding the Fourth Proportional to 1,399.26, 2,094.42 and 1,321.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,399.26 : 2,094.42 = 1,321.50 : x
2. Step 2: Convert to fraction form
   1,399.26/2,094.42 = 1,321.50/x
3. Step 3: Cross multiply
   1,399.26x = 2,094.42 × 1,321.50
4. Step 4: Simplify right side
   1,399.26x = 2,767,776.03
5. Step 5: Solve for x
   x = 2,767,776.03/1,399.26
6. Step 6: Final answer
   x = 1,978.03