Finding the Fourth Proportional to 12,861.72, 17,747.40 and 7,196.88

Step by Step Solution

1. Step 1: Write the proportion equation
   12,861.72 : 17,747.40 = 7,196.88 : x
2. Step 2: Convert to fraction form
   12,861.72/17,747.40 = 7,196.88/x
3. Step 3: Cross multiply
   12,861.72x = 17,747.40 × 7,196.88
4. Step 4: Simplify right side
   12,861.72x = 127,725,908.11
5. Step 5: Solve for x
   x = 127,725,908.11/12,861.72
6. Step 6: Final answer
   x = 9,930.70