Finding the Fourth Proportional to 1,422.32, 2,128.93 and 762.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,422.32 : 2,128.93 = 762.55 : x
2. Step 2: Convert to fraction form
   1,422.32/2,128.93 = 762.55/x
3. Step 3: Cross multiply
   1,422.32x = 2,128.93 × 762.55
4. Step 4: Simplify right side
   1,422.32x = 1,623,413.67
5. Step 5: Solve for x
   x = 1,623,413.67/1,422.32
6. Step 6: Final answer
   x = 1,141.39