Finding the Fourth Proportional to 109.94, 151.74 and 78.89

Step by Step Solution

1. Step 1: Write the proportion equation
   109.94 : 151.74 = 78.89 : x
2. Step 2: Convert to fraction form
   109.94/151.74 = 78.89/x
3. Step 3: Cross multiply
   109.94x = 151.74 × 78.89
4. Step 4: Simplify right side
   109.94x = 11,970.01
5. Step 5: Solve for x
   x = 11,970.01/109.94
6. Step 6: Final answer
   x = 108.88