Finding the Fourth Proportional to 100.87, 139.15 and 73.19

Step by Step Solution

1. Step 1: Write the proportion equation
   100.87 : 139.15 = 73.19 : x
2. Step 2: Convert to fraction form
   100.87/139.15 = 73.19/x
3. Step 3: Cross multiply
   100.87x = 139.15 × 73.19
4. Step 4: Simplify right side
   100.87x = 10,184.39
5. Step 5: Solve for x
   x = 10,184.39/100.87
6. Step 6: Final answer
   x = 100.97