Finding the Fourth Proportional to 12,909, 19,364.58 and 5,117.88

Step by Step Solution

1. Step 1: Write the proportion equation
   12,909 : 19,364.58 = 5,117.88 : x
2. Step 2: Convert to fraction form
   12,909/19,364.58 = 5,117.88/x
3. Step 3: Cross multiply
   12,909x = 19,364.58 × 5,117.88
4. Step 4: Simplify right side
   12,909x = 99,105,596.69
5. Step 5: Solve for x
   x = 99,105,596.69/12,909
6. Step 6: Final answer
   x = 7,677.25