Finding the Fourth Proportional to 99.83, 137.76 and 57.83

Step by Step Solution

1. Step 1: Write the proportion equation
   99.83 : 137.76 = 57.83 : x
2. Step 2: Convert to fraction form
   99.83/137.76 = 57.83/x
3. Step 3: Cross multiply
   99.83x = 137.76 × 57.83
4. Step 4: Simplify right side
   99.83x = 7,965.97
5. Step 5: Solve for x
   x = 7,965.97/99.83
6. Step 6: Final answer
   x = 79.80