Finding the Fourth Proportional to 12,910.50, 17,816.49 and 7,321.86

Step by Step Solution

1. Step 1: Write the proportion equation
   12,910.50 : 17,816.49 = 7,321.86 : x
2. Step 2: Convert to fraction form
   12,910.50/17,816.49 = 7,321.86/x
3. Step 3: Cross multiply
   12,910.50x = 17,816.49 × 7,321.86
4. Step 4: Simplify right side
   12,910.50x = 130,449,845.47
5. Step 5: Solve for x
   x = 130,449,845.47/12,910.50
6. Step 6: Final answer
   x = 10,104.17