Finding the Fourth Proportional to 12,877.72, 17,767.22 and 7,211.70

Step by Step Solution

1. Step 1: Write the proportion equation
   12,877.72 : 17,767.22 = 7,211.70 : x
2. Step 2: Convert to fraction form
   12,877.72/17,767.22 = 7,211.70/x
3. Step 3: Cross multiply
   12,877.72x = 17,767.22 × 7,211.70
4. Step 4: Simplify right side
   12,877.72x = 128,131,824.42
5. Step 5: Solve for x
   x = 128,131,824.42/12,877.72
6. Step 6: Final answer
   x = 9,949.89