Finding the Fourth Proportional to 12,200.27, 16,830.79 and 7,164.40

Step by Step Solution

1. Step 1: Write the proportion equation
   12,200.27 : 16,830.79 = 7,164.40 : x
2. Step 2: Convert to fraction form
   12,200.27/16,830.79 = 7,164.40/x
3. Step 3: Cross multiply
   12,200.27x = 16,830.79 × 7,164.40
4. Step 4: Simplify right side
   12,200.27x = 120,582,483.45
5. Step 5: Solve for x
   x = 120,582,483.45/12,200.27
6. Step 6: Final answer
   x = 9,883.59