Finding the Fourth Proportional to 12,820.76, 17,693.54 and 7,156.61

Step by Step Solution

1. Step 1: Write the proportion equation
   12,820.76 : 17,693.54 = 7,156.61 : x
2. Step 2: Convert to fraction form
   12,820.76/17,693.54 = 7,156.61/x
3. Step 3: Cross multiply
   12,820.76x = 17,693.54 × 7,156.61
4. Step 4: Simplify right side
   12,820.76x = 126,625,765.30
5. Step 5: Solve for x
   x = 126,625,765.30/12,820.76
6. Step 6: Final answer
   x = 9,876.62