Finding the Fourth Proportional to 1,869.72, 2,579.55 and 1,123.11

Step by Step Solution

1. Step 1: Write the proportion equation
   1,869.72 : 2,579.55 = 1,123.11 : x
2. Step 2: Convert to fraction form
   1,869.72/2,579.55 = 1,123.11/x
3. Step 3: Cross multiply
   1,869.72x = 2,579.55 × 1,123.11
4. Step 4: Simplify right side
   1,869.72x = 2,897,118.40
5. Step 5: Solve for x
   x = 2,897,118.40/1,869.72
6. Step 6: Final answer
   x = 1,549.49