Finding the Fourth Proportional to 100.83, 151.32 and 70.49

Step by Step Solution

1. Step 1: Write the proportion equation
   100.83 : 151.32 = 70.49 : x
2. Step 2: Convert to fraction form
   100.83/151.32 = 70.49/x
3. Step 3: Cross multiply
   100.83x = 151.32 × 70.49
4. Step 4: Simplify right side
   100.83x = 10,665.79
5. Step 5: Solve for x
   x = 10,665.79/100.83
6. Step 6: Final answer
   x = 105.78