Finding the Fourth Proportional to 100.49, 139.63 and 100.08

Step by Step Solution

1. Step 1: Write the proportion equation
   100.49 : 139.63 = 100.08 : x
2. Step 2: Convert to fraction form
   100.49/139.63 = 100.08/x
3. Step 3: Cross multiply
   100.49x = 139.63 × 100.08
4. Step 4: Simplify right side
   100.49x = 13,973.92
5. Step 5: Solve for x
   x = 13,973.92/100.49
6. Step 6: Final answer
   x = 139.06