Finding the Fourth Proportional to 12,876.57, 17,770.06 and 7,211.30

Step by Step Solution

1. Step 1: Write the proportion equation
   12,876.57 : 17,770.06 = 7,211.30 : x
2. Step 2: Convert to fraction form
   12,876.57/17,770.06 = 7,211.30/x
3. Step 3: Cross multiply
   12,876.57x = 17,770.06 × 7,211.30
4. Step 4: Simplify right side
   12,876.57x = 128,145,283.49
5. Step 5: Solve for x
   x = 128,145,283.49/12,876.57
6. Step 6: Final answer
   x = 9,951.82