Finding the Fourth Proportional to 8,419.50, 12,636.09 and 7,194.78

Step by Step Solution

1. Step 1: Write the proportion equation
   8,419.50 : 12,636.09 = 7,194.78 : x
2. Step 2: Convert to fraction form
   8,419.50/12,636.09 = 7,194.78/x
3. Step 3: Cross multiply
   8,419.50x = 12,636.09 × 7,194.78
4. Step 4: Simplify right side
   8,419.50x = 90,913,887.61
5. Step 5: Solve for x
   x = 90,913,887.61/8,419.50
6. Step 6: Final answer
   x = 10,798.02