Finding the Fourth Proportional to 99.33, 137.06 and 57.88

Step by Step Solution

1. Step 1: Write the proportion equation
   99.33 : 137.06 = 57.88 : x
2. Step 2: Convert to fraction form
   99.33/137.06 = 57.88/x
3. Step 3: Cross multiply
   99.33x = 137.06 × 57.88
4. Step 4: Simplify right side
   99.33x = 7,932.71
5. Step 5: Solve for x
   x = 7,932.71/99.33
6. Step 6: Final answer
   x = 79.87