Finding the Fourth Proportional to 1,729.47, 2,384.87 and 1,139.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,729.47 : 2,384.87 = 1,139.25 : x
2. Step 2: Convert to fraction form
   1,729.47/2,384.87 = 1,139.25/x
3. Step 3: Cross multiply
   1,729.47x = 2,384.87 × 1,139.25
4. Step 4: Simplify right side
   1,729.47x = 2,716,957.45
5. Step 5: Solve for x
   x = 2,716,957.45/1,729.47
6. Step 6: Final answer
   x = 1,570.98