Finding the Fourth Proportional to 1,398.15, 1,928.40 and 1,025.01

Step by Step Solution

1. Step 1: Write the proportion equation
   1,398.15 : 1,928.40 = 1,025.01 : x
2. Step 2: Convert to fraction form
   1,398.15/1,928.40 = 1,025.01/x
3. Step 3: Cross multiply
   1,398.15x = 1,928.40 × 1,025.01
4. Step 4: Simplify right side
   1,398.15x = 1,976,629.28
5. Step 5: Solve for x
   x = 1,976,629.28/1,398.15
6. Step 6: Final answer
   x = 1,413.75