Finding the Fourth Proportional to 99.67, 137.61 and 62.89

Step by Step Solution

1. Step 1: Write the proportion equation
   99.67 : 137.61 = 62.89 : x
2. Step 2: Convert to fraction form
   99.67/137.61 = 62.89/x
3. Step 3: Cross multiply
   99.67x = 137.61 × 62.89
4. Step 4: Simplify right side
   99.67x = 8,653.29
5. Step 5: Solve for x
   x = 8,653.29/99.67
6. Step 6: Final answer
   x = 86.82