Finding the Fourth Proportional to 13,196.78, 18,211.68 and 7,607.78

Step by Step Solution

1. Step 1: Write the proportion equation
   13,196.78 : 18,211.68 = 7,607.78 : x
2. Step 2: Convert to fraction form
   13,196.78/18,211.68 = 7,607.78/x
3. Step 3: Cross multiply
   13,196.78x = 18,211.68 × 7,607.78
4. Step 4: Simplify right side
   13,196.78x = 138,550,454.87
5. Step 5: Solve for x
   x = 138,550,454.87/13,196.78
6. Step 6: Final answer
   x = 10,498.81