Finding the Fourth Proportional to 53.39, 73.69 and 42.39

Step by Step Solution

1. Step 1: Write the proportion equation
   53.39 : 73.69 = 42.39 : x
2. Step 2: Convert to fraction form
   53.39/73.69 = 42.39/x
3. Step 3: Cross multiply
   53.39x = 73.69 × 42.39
4. Step 4: Simplify right side
   53.39x = 3,123.61
5. Step 5: Solve for x
   x = 3,123.61/53.39
6. Step 6: Final answer
   x = 58.50