Finding the Fourth Proportional to 100.52, 138.39 and 75.58

Step by Step Solution

1. Step 1: Write the proportion equation
   100.52 : 138.39 = 75.58 : x
2. Step 2: Convert to fraction form
   100.52/138.39 = 75.58/x
3. Step 3: Cross multiply
   100.52x = 138.39 × 75.58
4. Step 4: Simplify right side
   100.52x = 10,458.89
5. Step 5: Solve for x
   x = 10,458.89/100.52
6. Step 6: Final answer
   x = 104.05