Finding the Fourth Proportional to 1,397.52, 1,928.16 and 873.90

Step by Step Solution

1. Step 1: Write the proportion equation
   1,397.52 : 1,928.16 = 873.90 : x
2. Step 2: Convert to fraction form
   1,397.52/1,928.16 = 873.90/x
3. Step 3: Cross multiply
   1,397.52x = 1,928.16 × 873.90
4. Step 4: Simplify right side
   1,397.52x = 1,685,019.02
5. Step 5: Solve for x
   x = 1,685,019.02/1,397.52
6. Step 6: Final answer
   x = 1,205.72