Finding the Fourth Proportional to 99.33, 137.06 and 57.89

Step by Step Solution

1. Step 1: Write the proportion equation
   99.33 : 137.06 = 57.89 : x
2. Step 2: Convert to fraction form
   99.33/137.06 = 57.89/x
3. Step 3: Cross multiply
   99.33x = 137.06 × 57.89
4. Step 4: Simplify right side
   99.33x = 7,933.86
5. Step 5: Solve for x
   x = 7,933.86/99.33
6. Step 6: Final answer
   x = 79.87