Finding the Fourth Proportional to 1,431.39, 2,146.83 and 772.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,431.39 : 2,146.83 = 772.96 : x
2. Step 2: Convert to fraction form
   1,431.39/2,146.83 = 772.96/x
3. Step 3: Cross multiply
   1,431.39x = 2,146.83 × 772.96
4. Step 4: Simplify right side
   1,431.39x = 1,659,413.72
5. Step 5: Solve for x
   x = 1,659,413.72/1,431.39
6. Step 6: Final answer
   x = 1,159.30