Finding the Fourth Proportional to 1,431.59, 2,147.84 and 1,123.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,431.59 : 2,147.84 = 1,123.59 : x
2. Step 2: Convert to fraction form
   1,431.59/2,147.84 = 1,123.59/x
3. Step 3: Cross multiply
   1,431.59x = 2,147.84 × 1,123.59
4. Step 4: Simplify right side
   1,431.59x = 2,413,280.81
5. Step 5: Solve for x
   x = 2,413,280.81/1,431.59
6. Step 6: Final answer
   x = 1,685.73