Finding the Fourth Proportional to 109.34, 150.78 and 72.46

Step by Step Solution

1. Step 1: Write the proportion equation
   109.34 : 150.78 = 72.46 : x
2. Step 2: Convert to fraction form
   109.34/150.78 = 72.46/x
3. Step 3: Cross multiply
   109.34x = 150.78 × 72.46
4. Step 4: Simplify right side
   109.34x = 10,925.52
5. Step 5: Solve for x
   x = 10,925.52/109.34
6. Step 6: Final answer
   x = 99.92