Finding the Fourth Proportional to 8,920.10, 12,309.72 and 4,941.20

Step by Step Solution

1. Step 1: Write the proportion equation
   8,920.10 : 12,309.72 = 4,941.20 : x
2. Step 2: Convert to fraction form
   8,920.10/12,309.72 = 4,941.20/x
3. Step 3: Cross multiply
   8,920.10x = 12,309.72 × 4,941.20
4. Step 4: Simplify right side
   8,920.10x = 60,824,788.46
5. Step 5: Solve for x
   x = 60,824,788.46/8,920.10
6. Step 6: Final answer
   x = 6,818.85