Finding the Fourth Proportional to 10,151.39, 15,228.72 and 3,129.76

Step by Step Solution

1. Step 1: Write the proportion equation
   10,151.39 : 15,228.72 = 3,129.76 : x
2. Step 2: Convert to fraction form
   10,151.39/15,228.72 = 3,129.76/x
3. Step 3: Cross multiply
   10,151.39x = 15,228.72 × 3,129.76
4. Step 4: Simplify right side
   10,151.39x = 47,662,200.64
5. Step 5: Solve for x
   x = 47,662,200.64/10,151.39
6. Step 6: Final answer
   x = 4,695.14