Finding the Fourth Proportional to 12,807.38, 17,677.42 and 7,221.62

Step by Step Solution

1. Step 1: Write the proportion equation
   12,807.38 : 17,677.42 = 7,221.62 : x
2. Step 2: Convert to fraction form
   12,807.38/17,677.42 = 7,221.62/x
3. Step 3: Cross multiply
   12,807.38x = 17,677.42 × 7,221.62
4. Step 4: Simplify right side
   12,807.38x = 127,659,503.38
5. Step 5: Solve for x
   x = 127,659,503.38/12,807.38
6. Step 6: Final answer
   x = 9,967.66