Finding the Fourth Proportional to 12,910.73, 17,820.29 and 7,607.21

Step by Step Solution

1. Step 1: Write the proportion equation
   12,910.73 : 17,820.29 = 7,607.21 : x
2. Step 2: Convert to fraction form
   12,910.73/17,820.29 = 7,607.21/x
3. Step 3: Cross multiply
   12,910.73x = 17,820.29 × 7,607.21
4. Step 4: Simplify right side
   12,910.73x = 135,562,618.21
5. Step 5: Solve for x
   x = 135,562,618.21/12,910.73
6. Step 6: Final answer
   x = 10,500.00