Finding the Fourth Proportional to 12,428.57, 18,649.34 and 5,038.49

Step by Step Solution

1. Step 1: Write the proportion equation
   12,428.57 : 18,649.34 = 5,038.49 : x
2. Step 2: Convert to fraction form
   12,428.57/18,649.34 = 5,038.49/x
3. Step 3: Cross multiply
   12,428.57x = 18,649.34 × 5,038.49
4. Step 4: Simplify right side
   12,428.57x = 93,964,513.10
5. Step 5: Solve for x
   x = 93,964,513.10/12,428.57
6. Step 6: Final answer
   x = 7,560.36