Finding the Fourth Proportional to 1,428.55, 2,139.13 and 1,304.62

Step by Step Solution

1. Step 1: Write the proportion equation
   1,428.55 : 2,139.13 = 1,304.62 : x
2. Step 2: Convert to fraction form
   1,428.55/2,139.13 = 1,304.62/x
3. Step 3: Cross multiply
   1,428.55x = 2,139.13 × 1,304.62
4. Step 4: Simplify right side
   1,428.55x = 2,790,751.78
5. Step 5: Solve for x
   x = 2,790,751.78/1,428.55
6. Step 6: Final answer
   x = 1,953.56