Finding the Fourth Proportional to 8,136.78, 12,191.16 and 5,498.46

Step by Step Solution

1. Step 1: Write the proportion equation
   8,136.78 : 12,191.16 = 5,498.46 : x
2. Step 2: Convert to fraction form
   8,136.78/12,191.16 = 5,498.46/x
3. Step 3: Cross multiply
   8,136.78x = 12,191.16 × 5,498.46
4. Step 4: Simplify right side
   8,136.78x = 67,032,605.61
5. Step 5: Solve for x
   x = 67,032,605.61/8,136.78
6. Step 6: Final answer
   x = 8,238.22