Finding the Fourth Proportional to 8,815.74, 12,164.82 and 5,278.86

Step by Step Solution

1. Step 1: Write the proportion equation
   8,815.74 : 12,164.82 = 5,278.86 : x
2. Step 2: Convert to fraction form
   8,815.74/12,164.82 = 5,278.86/x
3. Step 3: Cross multiply
   8,815.74x = 12,164.82 × 5,278.86
4. Step 4: Simplify right side
   8,815.74x = 64,216,381.71
5. Step 5: Solve for x
   x = 64,216,381.71/8,815.74
6. Step 6: Final answer
   x = 7,284.29