Finding the Fourth Proportional to 100.83, 139.12 and 67.68

Step by Step Solution

1. Step 1: Write the proportion equation
   100.83 : 139.12 = 67.68 : x
2. Step 2: Convert to fraction form
   100.83/139.12 = 67.68/x
3. Step 3: Cross multiply
   100.83x = 139.12 × 67.68
4. Step 4: Simplify right side
   100.83x = 9,415.82
5. Step 5: Solve for x
   x = 9,415.82/100.83
6. Step 6: Final answer
   x = 93.38