Finding the Fourth Proportional to 8,978.81, 12,364.01 and 8,779.67

Step by Step Solution

1. Step 1: Write the proportion equation
   8,978.81 : 12,364.01 = 8,779.67 : x
2. Step 2: Convert to fraction form
   8,978.81/12,364.01 = 8,779.67/x
3. Step 3: Cross multiply
   8,978.81x = 12,364.01 × 8,779.67
4. Step 4: Simplify right side
   8,978.81x = 108,551,887.81
5. Step 5: Solve for x
   x = 108,551,887.81/8,978.81
6. Step 6: Final answer
   x = 12,089.79