Finding the Fourth Proportional to 2,072.61, 3,108.81 and 839.69

Step by Step Solution

1. Step 1: Write the proportion equation
   2,072.61 : 3,108.81 = 839.69 : x
2. Step 2: Convert to fraction form
   2,072.61/3,108.81 = 839.69/x
3. Step 3: Cross multiply
   2,072.61x = 3,108.81 × 839.69
4. Step 4: Simplify right side
   2,072.61x = 2,610,437.59
5. Step 5: Solve for x
   x = 2,610,437.59/2,072.61
6. Step 6: Final answer
   x = 1,259.49