Finding the Fourth Proportional to 99.72, 137.57 and 62.82

Step by Step Solution

1. Step 1: Write the proportion equation
   99.72 : 137.57 = 62.82 : x
2. Step 2: Convert to fraction form
   99.72/137.57 = 62.82/x
3. Step 3: Cross multiply
   99.72x = 137.57 × 62.82
4. Step 4: Simplify right side
   99.72x = 8,642.15
5. Step 5: Solve for x
   x = 8,642.15/99.72
6. Step 6: Final answer
   x = 86.66