Finding the Fourth Proportional to 13,112.32, 19,638.24 and 7,906.72

Step by Step Solution

1. Step 1: Write the proportion equation
   13,112.32 : 19,638.24 = 7,906.72 : x
2. Step 2: Convert to fraction form
   13,112.32/19,638.24 = 7,906.72/x
3. Step 3: Cross multiply
   13,112.32x = 19,638.24 × 7,906.72
4. Step 4: Simplify right side
   13,112.32x = 155,274,064.97
5. Step 5: Solve for x
   x = 155,274,064.97/13,112.32
6. Step 6: Final answer
   x = 11,841.85