Finding the Fourth Proportional to 1,139.22, 1,570.52 and 1,123.62

Step by Step Solution

1. Step 1: Write the proportion equation
   1,139.22 : 1,570.52 = 1,123.62 : x
2. Step 2: Convert to fraction form
   1,139.22/1,570.52 = 1,123.62/x
3. Step 3: Cross multiply
   1,139.22x = 1,570.52 × 1,123.62
4. Step 4: Simplify right side
   1,139.22x = 1,764,662.06
5. Step 5: Solve for x
   x = 1,764,662.06/1,139.22
6. Step 6: Final answer
   x = 1,549.01