Finding the Fourth Proportional to 1,139.41, 1,571.59 and 1,101.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,139.41 : 1,571.59 = 1,101.30 : x
2. Step 2: Convert to fraction form
   1,139.41/1,571.59 = 1,101.30/x
3. Step 3: Cross multiply
   1,139.41x = 1,571.59 × 1,101.30
4. Step 4: Simplify right side
   1,139.41x = 1,730,792.07
5. Step 5: Solve for x
   x = 1,730,792.07/1,139.41
6. Step 6: Final answer
   x = 1,519.02