Finding the Fourth Proportional to 91.55, 137.18 and 55.42

Step by Step Solution

1. Step 1: Write the proportion equation
   91.55 : 137.18 = 55.42 : x
2. Step 2: Convert to fraction form
   91.55/137.18 = 55.42/x
3. Step 3: Cross multiply
   91.55x = 137.18 × 55.42
4. Step 4: Simplify right side
   91.55x = 7,602.31
5. Step 5: Solve for x
   x = 7,602.31/91.55
6. Step 6: Final answer
   x = 83.04