Finding the Fourth Proportional to 100.78, 150.89 and 73.64

Step by Step Solution

1. Step 1: Write the proportion equation
   100.78 : 150.89 = 73.64 : x
2. Step 2: Convert to fraction form
   100.78/150.89 = 73.64/x
3. Step 3: Cross multiply
   100.78x = 150.89 × 73.64
4. Step 4: Simplify right side
   100.78x = 11,111.55
5. Step 5: Solve for x
   x = 11,111.55/100.78
6. Step 6: Final answer
   x = 110.26