Finding the Fourth Proportional to 1,287.06, 1,929.86 and 739.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,287.06 : 1,929.86 = 739.38 : x
2. Step 2: Convert to fraction form
   1,287.06/1,929.86 = 739.38/x
3. Step 3: Cross multiply
   1,287.06x = 1,929.86 × 739.38
4. Step 4: Simplify right side
   1,287.06x = 1,426,899.89
5. Step 5: Solve for x
   x = 1,426,899.89/1,287.06
6. Step 6: Final answer
   x = 1,108.65