Finding the Fourth Proportional to 100.83, 139.05 and 69.69

Step by Step Solution

1. Step 1: Write the proportion equation
   100.83 : 139.05 = 69.69 : x
2. Step 2: Convert to fraction form
   100.83/139.05 = 69.69/x
3. Step 3: Cross multiply
   100.83x = 139.05 × 69.69
4. Step 4: Simplify right side
   100.83x = 9,690.39
5. Step 5: Solve for x
   x = 9,690.39/100.83
6. Step 6: Final answer
   x = 96.11