Finding the Fourth Proportional to 109.91, 151.72 and 73.10

Step by Step Solution

1. Step 1: Write the proportion equation
   109.91 : 151.72 = 73.10 : x
2. Step 2: Convert to fraction form
   109.91/151.72 = 73.10/x
3. Step 3: Cross multiply
   109.91x = 151.72 × 73.10
4. Step 4: Simplify right side
   109.91x = 11,090.93
5. Step 5: Solve for x
   x = 11,090.93/109.91
6. Step 6: Final answer
   x = 100.91