Finding the Fourth Proportional to 1,760.86, 2,429.67 and 1,139.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,760.86 : 2,429.67 = 1,139.50 : x
2. Step 2: Convert to fraction form
   1,760.86/2,429.67 = 1,139.50/x
3. Step 3: Cross multiply
   1,760.86x = 2,429.67 × 1,139.50
4. Step 4: Simplify right side
   1,760.86x = 2,768,608.97
5. Step 5: Solve for x
   x = 2,768,608.97/1,760.86
6. Step 6: Final answer
   x = 1,572.30