Finding the Fourth Proportional to 12,910.02, 17,815.32 and 7,321.02

Step by Step Solution

1. Step 1: Write the proportion equation
   12,910.02 : 17,815.32 = 7,321.02 : x
2. Step 2: Convert to fraction form
   12,910.02/17,815.32 = 7,321.02/x
3. Step 3: Cross multiply
   12,910.02x = 17,815.32 × 7,321.02
4. Step 4: Simplify right side
   12,910.02x = 130,426,314.03
5. Step 5: Solve for x
   x = 130,426,314.03/12,910.02
6. Step 6: Final answer
   x = 10,102.72