Finding the Fourth Proportional to 6,139.90, 8,471.60 and 3,622.12

Step by Step Solution

1. Step 1: Write the proportion equation
   6,139.90 : 8,471.60 = 3,622.12 : x
2. Step 2: Convert to fraction form
   6,139.90/8,471.60 = 3,622.12/x
3. Step 3: Cross multiply
   6,139.90x = 8,471.60 × 3,622.12
4. Step 4: Simplify right side
   6,139.90x = 30,685,151.79
5. Step 5: Solve for x
   x = 30,685,151.79/6,139.90
6. Step 6: Final answer
   x = 4,997.66