Finding the Fourth Proportional to 100.01, 149.87 and 72.89

Step by Step Solution

1. Step 1: Write the proportion equation
   100.01 : 149.87 = 72.89 : x
2. Step 2: Convert to fraction form
   100.01/149.87 = 72.89/x
3. Step 3: Cross multiply
   100.01x = 149.87 × 72.89
4. Step 4: Simplify right side
   100.01x = 10,922.91
5. Step 5: Solve for x
   x = 10,922.91/100.01
6. Step 6: Final answer
   x = 109.22