Finding the Fourth Proportional to 99.39, 137.16 and 57.96

Step by Step Solution

1. Step 1: Write the proportion equation
   99.39 : 137.16 = 57.96 : x
2. Step 2: Convert to fraction form
   99.39/137.16 = 57.96/x
3. Step 3: Cross multiply
   99.39x = 137.16 × 57.96
4. Step 4: Simplify right side
   99.39x = 7,948.82
5. Step 5: Solve for x
   x = 7,948.82/99.39
6. Step 6: Final answer
   x = 79.98