Finding the Fourth Proportional to 12,647.67, 18,976.43 and 5,250.25

Step by Step Solution

1. Step 1: Write the proportion equation
   12,647.67 : 18,976.43 = 5,250.25 : x
2. Step 2: Convert to fraction form
   12,647.67/18,976.43 = 5,250.25/x
3. Step 3: Cross multiply
   12,647.67x = 18,976.43 × 5,250.25
4. Step 4: Simplify right side
   12,647.67x = 99,631,001.61
5. Step 5: Solve for x
   x = 99,631,001.61/12,647.67
6. Step 6: Final answer
   x = 7,877.42