Finding the Fourth Proportional to 7,085.93, 9,778.81 and 3,899.59

Step by Step Solution

1. Step 1: Write the proportion equation
   7,085.93 : 9,778.81 = 3,899.59 : x
2. Step 2: Convert to fraction form
   7,085.93/9,778.81 = 3,899.59/x
3. Step 3: Cross multiply
   7,085.93x = 9,778.81 × 3,899.59
4. Step 4: Simplify right side
   7,085.93x = 38,133,349.69
5. Step 5: Solve for x
   x = 38,133,349.69/7,085.93
6. Step 6: Final answer
   x = 5,381.56