Finding the Fourth Proportional to 10,148.49, 15,225.57 and 3,128.63

Step by Step Solution

1. Step 1: Write the proportion equation
   10,148.49 : 15,225.57 = 3,128.63 : x
2. Step 2: Convert to fraction form
   10,148.49/15,225.57 = 3,128.63/x
3. Step 3: Cross multiply
   10,148.49x = 15,225.57 × 3,128.63
4. Step 4: Simplify right side
   10,148.49x = 47,635,098.94
5. Step 5: Solve for x
   x = 47,635,098.94/10,148.49
6. Step 6: Final answer
   x = 4,693.81