Finding the Fourth Proportional to 8,708.67, 12,018.24 and 5,123.91

Step by Step Solution

1. Step 1: Write the proportion equation
   8,708.67 : 12,018.24 = 5,123.91 : x
2. Step 2: Convert to fraction form
   8,708.67/12,018.24 = 5,123.91/x
3. Step 3: Cross multiply
   8,708.67x = 12,018.24 × 5,123.91
4. Step 4: Simplify right side
   8,708.67x = 61,580,380.12
5. Step 5: Solve for x
   x = 61,580,380.12/8,708.67
6. Step 6: Final answer
   x = 7,071.16