Finding the Fourth Proportional to 12,877.55, 17,769.54 and 7,211.51

Step by Step Solution

1. Step 1: Write the proportion equation
   12,877.55 : 17,769.54 = 7,211.51 : x
2. Step 2: Convert to fraction form
   12,877.55/17,769.54 = 7,211.51/x
3. Step 3: Cross multiply
   12,877.55x = 17,769.54 × 7,211.51
4. Step 4: Simplify right side
   12,877.55x = 128,145,126.56
5. Step 5: Solve for x
   x = 128,145,126.56/12,877.55
6. Step 6: Final answer
   x = 9,951.05