Finding the Fourth Proportional to 100.94, 139.37 and 74.72

Step by Step Solution

1. Step 1: Write the proportion equation
   100.94 : 139.37 = 74.72 : x
2. Step 2: Convert to fraction form
   100.94/139.37 = 74.72/x
3. Step 3: Cross multiply
   100.94x = 139.37 × 74.72
4. Step 4: Simplify right side
   100.94x = 10,413.73
5. Step 5: Solve for x
   x = 10,413.73/100.94
6. Step 6: Final answer
   x = 103.17