Finding the Fourth Proportional to 100.99, 139.39 and 59.54

Step by Step Solution

1. Step 1: Write the proportion equation
   100.99 : 139.39 = 59.54 : x
2. Step 2: Convert to fraction form
   100.99/139.39 = 59.54/x
3. Step 3: Cross multiply
   100.99x = 139.39 × 59.54
4. Step 4: Simplify right side
   100.99x = 8,299.28
5. Step 5: Solve for x
   x = 8,299.28/100.99
6. Step 6: Final answer
   x = 82.18