Finding the Fourth Proportional to 53.39, 73.72 and 42.31

Step by Step Solution

1. Step 1: Write the proportion equation
   53.39 : 73.72 = 42.31 : x
2. Step 2: Convert to fraction form
   53.39/73.72 = 42.31/x
3. Step 3: Cross multiply
   53.39x = 73.72 × 42.31
4. Step 4: Simplify right side
   53.39x = 3,119.09
5. Step 5: Solve for x
   x = 3,119.09/53.39
6. Step 6: Final answer
   x = 58.42