Finding the Fourth Proportional to 8,899.30, 12,279.94 and 4,919.86

Step by Step Solution

1. Step 1: Write the proportion equation
   8,899.30 : 12,279.94 = 4,919.86 : x
2. Step 2: Convert to fraction form
   8,899.30/12,279.94 = 4,919.86/x
3. Step 3: Cross multiply
   8,899.30x = 12,279.94 × 4,919.86
4. Step 4: Simplify right side
   8,899.30x = 60,415,585.61
5. Step 5: Solve for x
   x = 60,415,585.61/8,899.30
6. Step 6: Final answer
   x = 6,788.80