Finding the Fourth Proportional to 109.99, 151.78 and 68.55

Step by Step Solution

1. Step 1: Write the proportion equation
   109.99 : 151.78 = 68.55 : x
2. Step 2: Convert to fraction form
   109.99/151.78 = 68.55/x
3. Step 3: Cross multiply
   109.99x = 151.78 × 68.55
4. Step 4: Simplify right side
   109.99x = 10,404.52
5. Step 5: Solve for x
   x = 10,404.52/109.99
6. Step 6: Final answer
   x = 94.60