Finding the Fourth Proportional to 8,974.62, 12,381.90 and 5,196.78

Step by Step Solution

1. Step 1: Write the proportion equation
   8,974.62 : 12,381.90 = 5,196.78 : x
2. Step 2: Convert to fraction form
   8,974.62/12,381.90 = 5,196.78/x
3. Step 3: Cross multiply
   8,974.62x = 12,381.90 × 5,196.78
4. Step 4: Simplify right side
   8,974.62x = 64,346,010.28
5. Step 5: Solve for x
   x = 64,346,010.28/8,974.62
6. Step 6: Final answer
   x = 7,169.78