Finding the Fourth Proportional to 1,397.80, 1,928.64 and 873.46

Step by Step Solution

1. Step 1: Write the proportion equation
   1,397.80 : 1,928.64 = 873.46 : x
2. Step 2: Convert to fraction form
   1,397.80/1,928.64 = 873.46/x
3. Step 3: Cross multiply
   1,397.80x = 1,928.64 × 873.46
4. Step 4: Simplify right side
   1,397.80x = 1,684,589.89
5. Step 5: Solve for x
   x = 1,684,589.89/1,397.80
6. Step 6: Final answer
   x = 1,205.17