Finding the Fourth Proportional to 100.69, 138.83 and 73.05

Step by Step Solution

1. Step 1: Write the proportion equation
   100.69 : 138.83 = 73.05 : x
2. Step 2: Convert to fraction form
   100.69/138.83 = 73.05/x
3. Step 3: Cross multiply
   100.69x = 138.83 × 73.05
4. Step 4: Simplify right side
   100.69x = 10,140.84
5. Step 5: Solve for x
   x = 10,140.84/100.69
6. Step 6: Final answer
   x = 100.71