Finding the Fourth Proportional to 100.89, 151.34 and 71.93

Step by Step Solution

1. Step 1: Write the proportion equation
   100.89 : 151.34 = 71.93 : x
2. Step 2: Convert to fraction form
   100.89/151.34 = 71.93/x
3. Step 3: Cross multiply
   100.89x = 151.34 × 71.93
4. Step 4: Simplify right side
   100.89x = 10,885.90
5. Step 5: Solve for x
   x = 10,885.90/100.89
6. Step 6: Final answer
   x = 107.90