Finding the Fourth Proportional to 12,910.12, 17,815.62 and 7,321

Step by Step Solution

1. Step 1: Write the proportion equation
   12,910.12 : 17,815.62 = 7,321 : x
2. Step 2: Convert to fraction form
   12,910.12/17,815.62 = 7,321/x
3. Step 3: Cross multiply
   12,910.12x = 17,815.62 × 7,321
4. Step 4: Simplify right side
   12,910.12x = 130,428,154.02
5. Step 5: Solve for x
   x = 130,428,154.02/12,910.12
6. Step 6: Final answer
   x = 10,102.78