Finding the Fourth Proportional to 10,139.72, 15,212.32 and 3,119.58

Step by Step Solution

1. Step 1: Write the proportion equation
   10,139.72 : 15,212.32 = 3,119.58 : x
2. Step 2: Convert to fraction form
   10,139.72/15,212.32 = 3,119.58/x
3. Step 3: Cross multiply
   10,139.72x = 15,212.32 × 3,119.58
4. Step 4: Simplify right side
   10,139.72x = 47,456,041.43
5. Step 5: Solve for x
   x = 47,456,041.43/10,139.72
6. Step 6: Final answer
   x = 4,680.21