Finding the Fourth Proportional to 99.34, 137.09 and 57.89

Step by Step Solution

1. Step 1: Write the proportion equation
   99.34 : 137.09 = 57.89 : x
2. Step 2: Convert to fraction form
   99.34/137.09 = 57.89/x
3. Step 3: Cross multiply
   99.34x = 137.09 × 57.89
4. Step 4: Simplify right side
   99.34x = 7,936.19
5. Step 5: Solve for x
   x = 7,936.19/99.34
6. Step 6: Final answer
   x = 79.89