Finding the Fourth Proportional to 12,645.86, 18,974.57 and 5,251.98

Step by Step Solution

1. Step 1: Write the proportion equation
   12,645.86 : 18,974.57 = 5,251.98 : x
2. Step 2: Convert to fraction form
   12,645.86/18,974.57 = 5,251.98/x
3. Step 3: Cross multiply
   12,645.86x = 18,974.57 × 5,251.98
4. Step 4: Simplify right side
   12,645.86x = 99,654,035.89
5. Step 5: Solve for x
   x = 99,654,035.89/12,645.86
6. Step 6: Final answer
   x = 7,880.37