Finding the Fourth Proportional to 139.48, 208.62 and 100.52

Step by Step Solution

1. Step 1: Write the proportion equation
   139.48 : 208.62 = 100.52 : x
2. Step 2: Convert to fraction form
   139.48/208.62 = 100.52/x
3. Step 3: Cross multiply
   139.48x = 208.62 × 100.52
4. Step 4: Simplify right side
   139.48x = 20,970.88
5. Step 5: Solve for x
   x = 20,970.88/139.48
6. Step 6: Final answer
   x = 150.35