Finding the Fourth Proportional to 2,123.60, 3,187.20 and 955.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,123.60 : 3,187.20 = 955.40 : x
2. Step 2: Convert to fraction form
   2,123.60/3,187.20 = 955.40/x
3. Step 3: Cross multiply
   2,123.60x = 3,187.20 × 955.40
4. Step 4: Simplify right side
   2,123.60x = 3,045,050.88
5. Step 5: Solve for x
   x = 3,045,050.88/2,123.60
6. Step 6: Final answer
   x = 1,433.91