Finding the Fourth Proportional to 9,399.76, 12,971.82 and 5,207.74

Step by Step Solution

1. Step 1: Write the proportion equation
   9,399.76 : 12,971.82 = 5,207.74 : x
2. Step 2: Convert to fraction form
   9,399.76/12,971.82 = 5,207.74/x
3. Step 3: Cross multiply
   9,399.76x = 12,971.82 × 5,207.74
4. Step 4: Simplify right side
   9,399.76x = 67,553,865.89
5. Step 5: Solve for x
   x = 67,553,865.89/9,399.76
6. Step 6: Final answer
   x = 7,186.76