Finding the Fourth Proportional to 10,428.60, 15,647.82 and 5,238.12

Step by Step Solution

1. Step 1: Write the proportion equation
   10,428.60 : 15,647.82 = 5,238.12 : x
2. Step 2: Convert to fraction form
   10,428.60/15,647.82 = 5,238.12/x
3. Step 3: Cross multiply
   10,428.60x = 15,647.82 × 5,238.12
4. Step 4: Simplify right side
   10,428.60x = 81,965,158.90
5. Step 5: Solve for x
   x = 81,965,158.90/10,428.60
6. Step 6: Final answer
   x = 7,859.65