Finding the Fourth Proportional to 12,411.86, 17,137.32 and 7,638.22

Step by Step Solution

1. Step 1: Write the proportion equation
   12,411.86 : 17,137.32 = 7,638.22 : x
2. Step 2: Convert to fraction form
   12,411.86/17,137.32 = 7,638.22/x
3. Step 3: Cross multiply
   12,411.86x = 17,137.32 × 7,638.22
4. Step 4: Simplify right side
   12,411.86x = 130,898,620.37
5. Step 5: Solve for x
   x = 130,898,620.37/12,411.86
6. Step 6: Final answer
   x = 10,546.25