Finding the Fourth Proportional to 10,139.23, 15,209.39 and 3,214.27

Step by Step Solution

1. Step 1: Write the proportion equation
   10,139.23 : 15,209.39 = 3,214.27 : x
2. Step 2: Convert to fraction form
   10,139.23/15,209.39 = 3,214.27/x
3. Step 3: Cross multiply
   10,139.23x = 15,209.39 × 3,214.27
4. Step 4: Simplify right side
   10,139.23x = 48,887,086.00
5. Step 5: Solve for x
   x = 48,887,086.00/10,139.23
6. Step 6: Final answer
   x = 4,821.58