Finding the Fourth Proportional to 99.83, 137.79 and 73.61

Step by Step Solution

1. Step 1: Write the proportion equation
   99.83 : 137.79 = 73.61 : x
2. Step 2: Convert to fraction form
   99.83/137.79 = 73.61/x
3. Step 3: Cross multiply
   99.83x = 137.79 × 73.61
4. Step 4: Simplify right side
   99.83x = 10,142.72
5. Step 5: Solve for x
   x = 10,142.72/99.83
6. Step 6: Final answer
   x = 101.60