Finding the Fourth Proportional to 2,123.55, 2,929.10 and 1,680.75

Step by Step Solution

1. Step 1: Write the proportion equation
   2,123.55 : 2,929.10 = 1,680.75 : x
2. Step 2: Convert to fraction form
   2,123.55/2,929.10 = 1,680.75/x
3. Step 3: Cross multiply
   2,123.55x = 2,929.10 × 1,680.75
4. Step 4: Simplify right side
   2,123.55x = 4,923,076.42
5. Step 5: Solve for x
   x = 4,923,076.42/2,123.55
6. Step 6: Final answer
   x = 2,318.32