Finding the Fourth Proportional to 2,123.08, 2,929.70 and 1,191.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,123.08 : 2,929.70 = 1,191.72 : x
2. Step 2: Convert to fraction form
   2,123.08/2,929.70 = 1,191.72/x
3. Step 3: Cross multiply
   2,123.08x = 2,929.70 × 1,191.72
4. Step 4: Simplify right side
   2,123.08x = 3,491,382.08
5. Step 5: Solve for x
   x = 3,491,382.08/2,123.08
6. Step 6: Final answer
   x = 1,644.49