Finding the Fourth Proportional to 1,413.60, 1,948.92 and 1,020.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,413.60 : 1,948.92 = 1,020.72 : x
2. Step 2: Convert to fraction form
   1,413.60/1,948.92 = 1,020.72/x
3. Step 3: Cross multiply
   1,413.60x = 1,948.92 × 1,020.72
4. Step 4: Simplify right side
   1,413.60x = 1,989,301.62
5. Step 5: Solve for x
   x = 1,989,301.62/1,413.60
6. Step 6: Final answer
   x = 1,407.26