Finding the Fourth Proportional to 99.69, 137.55 and 62.83

Step by Step Solution

1. Step 1: Write the proportion equation
   99.69 : 137.55 = 62.83 : x
2. Step 2: Convert to fraction form
   99.69/137.55 = 62.83/x
3. Step 3: Cross multiply
   99.69x = 137.55 × 62.83
4. Step 4: Simplify right side
   99.69x = 8,641.95
5. Step 5: Solve for x
   x = 8,641.95/99.69
6. Step 6: Final answer
   x = 86.69