Finding the Fourth Proportional to 6,156.78, 8,497.02 and 3,639.72

Step by Step Solution

1. Step 1: Write the proportion equation
   6,156.78 : 8,497.02 = 3,639.72 : x
2. Step 2: Convert to fraction form
   6,156.78/8,497.02 = 3,639.72/x
3. Step 3: Cross multiply
   6,156.78x = 8,497.02 × 3,639.72
4. Step 4: Simplify right side
   6,156.78x = 30,926,773.63
5. Step 5: Solve for x
   x = 30,926,773.63/6,156.78
6. Step 6: Final answer
   x = 5,023.21