Finding the Fourth Proportional to 72.32, 108.52 and 55.31

Step by Step Solution

1. Step 1: Write the proportion equation
   72.32 : 108.52 = 55.31 : x
2. Step 2: Convert to fraction form
   72.32/108.52 = 55.31/x
3. Step 3: Cross multiply
   72.32x = 108.52 × 55.31
4. Step 4: Simplify right side
   72.32x = 6,002.51
5. Step 5: Solve for x
   x = 6,002.51/72.32
6. Step 6: Final answer
   x = 83.00