Finding the Fourth Proportional to 8,755.04, 12,081.90 and 4,978.20

Step by Step Solution

1. Step 1: Write the proportion equation
   8,755.04 : 12,081.90 = 4,978.20 : x
2. Step 2: Convert to fraction form
   8,755.04/12,081.90 = 4,978.20/x
3. Step 3: Cross multiply
   8,755.04x = 12,081.90 × 4,978.20
4. Step 4: Simplify right side
   8,755.04x = 60,146,141.22
5. Step 5: Solve for x
   x = 60,146,141.22/8,755.04
6. Step 6: Final answer
   x = 6,869.89