Finding the Fourth Proportional to 72.86, 109.32 and 67.70

Step by Step Solution

1. Step 1: Write the proportion equation
   72.86 : 109.32 = 67.70 : x
2. Step 2: Convert to fraction form
   72.86/109.32 = 67.70/x
3. Step 3: Cross multiply
   72.86x = 109.32 × 67.70
4. Step 4: Simplify right side
   72.86x = 7,400.96
5. Step 5: Solve for x
   x = 7,400.96/72.86
6. Step 6: Final answer
   x = 101.58