Finding the Fourth Proportional to 99.86, 137.72 and 68.82

Step by Step Solution

1. Step 1: Write the proportion equation
   99.86 : 137.72 = 68.82 : x
2. Step 2: Convert to fraction form
   99.86/137.72 = 68.82/x
3. Step 3: Cross multiply
   99.86x = 137.72 × 68.82
4. Step 4: Simplify right side
   99.86x = 9,477.89
5. Step 5: Solve for x
   x = 9,477.89/99.86
6. Step 6: Final answer
   x = 94.91