Finding the Fourth Proportional to 5,639.67, 7,774.62 and 3,955.86

Step by Step Solution

1. Step 1: Write the proportion equation
   5,639.67 : 7,774.62 = 3,955.86 : x
2. Step 2: Convert to fraction form
   5,639.67/7,774.62 = 3,955.86/x
3. Step 3: Cross multiply
   5,639.67x = 7,774.62 × 3,955.86
4. Step 4: Simplify right side
   5,639.67x = 30,755,308.27
5. Step 5: Solve for x
   x = 30,755,308.27/5,639.67
6. Step 6: Final answer
   x = 5,453.39