Finding the Fourth Proportional to 91.98, 138 and 37.89

Step by Step Solution

1. Step 1: Write the proportion equation
   91.98 : 138 = 37.89 : x
2. Step 2: Convert to fraction form
   91.98/138 = 37.89/x
3. Step 3: Cross multiply
   91.98x = 138 × 37.89
4. Step 4: Simplify right side
   91.98x = 5,228.82
5. Step 5: Solve for x
   x = 5,228.82/91.98
6. Step 6: Final answer
   x = 56.85