Finding the Fourth Proportional to 12,642.76, 18,958.27 and 7,379.29

Step by Step Solution

1. Step 1: Write the proportion equation
   12,642.76 : 18,958.27 = 7,379.29 : x
2. Step 2: Convert to fraction form
   12,642.76/18,958.27 = 7,379.29/x
3. Step 3: Cross multiply
   12,642.76x = 18,958.27 × 7,379.29
4. Step 4: Simplify right side
   12,642.76x = 139,898,506.38
5. Step 5: Solve for x
   x = 139,898,506.38/12,642.76
6. Step 6: Final answer
   x = 11,065.51