Finding the Fourth Proportional to 2,188.47, 3,280.42 and 955.55

Step by Step Solution

1. Step 1: Write the proportion equation
   2,188.47 : 3,280.42 = 955.55 : x
2. Step 2: Convert to fraction form
   2,188.47/3,280.42 = 955.55/x
3. Step 3: Cross multiply
   2,188.47x = 3,280.42 × 955.55
4. Step 4: Simplify right side
   2,188.47x = 3,134,611.14
5. Step 5: Solve for x
   x = 3,134,611.14/2,188.47
6. Step 6: Final answer
   x = 1,432.33