Finding the Fourth Proportional to 1,935.72, 2,671.32 and 1,139.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,935.72 : 2,671.32 = 1,139.61 : x
2. Step 2: Convert to fraction form
   1,935.72/2,671.32 = 1,139.61/x
3. Step 3: Cross multiply
   1,935.72x = 2,671.32 × 1,139.61
4. Step 4: Simplify right side
   1,935.72x = 3,044,262.99
5. Step 5: Solve for x
   x = 3,044,262.99/1,935.72
6. Step 6: Final answer
   x = 1,572.68