Finding the Fourth Proportional to 1,869.61, 2,579.71 and 1,123.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,869.61 : 2,579.71 = 1,123.30 : x
2. Step 2: Convert to fraction form
   1,869.61/2,579.71 = 1,123.30/x
3. Step 3: Cross multiply
   1,869.61x = 2,579.71 × 1,123.30
4. Step 4: Simplify right side
   1,869.61x = 2,897,769.73
5. Step 5: Solve for x
   x = 2,897,769.73/1,869.61
6. Step 6: Final answer
   x = 1,549.93