Finding the Fourth Proportional to 100.08, 138.24 and 73.89

Step by Step Solution

1. Step 1: Write the proportion equation
   100.08 : 138.24 = 73.89 : x
2. Step 2: Convert to fraction form
   100.08/138.24 = 73.89/x
3. Step 3: Cross multiply
   100.08x = 138.24 × 73.89
4. Step 4: Simplify right side
   100.08x = 10,214.55
5. Step 5: Solve for x
   x = 10,214.55/100.08
6. Step 6: Final answer
   x = 102.06