Finding the Fourth Proportional to 8,421.41, 12,623.84 and 7,174.82

Step by Step Solution

1. Step 1: Write the proportion equation
   8,421.41 : 12,623.84 = 7,174.82 : x
2. Step 2: Convert to fraction form
   8,421.41/12,623.84 = 7,174.82/x
3. Step 3: Cross multiply
   8,421.41x = 12,623.84 × 7,174.82
4. Step 4: Simplify right side
   8,421.41x = 90,573,680.72
5. Step 5: Solve for x
   x = 90,573,680.72/8,421.41
6. Step 6: Final answer
   x = 10,755.17