Finding the Fourth Proportional to 100.93, 139.20 and 67.72

Step by Step Solution

1. Step 1: Write the proportion equation
   100.93 : 139.20 = 67.72 : x
2. Step 2: Convert to fraction form
   100.93/139.20 = 67.72/x
3. Step 3: Cross multiply
   100.93x = 139.20 × 67.72
4. Step 4: Simplify right side
   100.93x = 9,426.62
5. Step 5: Solve for x
   x = 9,426.62/100.93
6. Step 6: Final answer
   x = 93.40