Finding the Fourth Proportional to 72.64, 109.08 and 42.28

Step by Step Solution

1. Step 1: Write the proportion equation
   72.64 : 109.08 = 42.28 : x
2. Step 2: Convert to fraction form
   72.64/109.08 = 42.28/x
3. Step 3: Cross multiply
   72.64x = 109.08 × 42.28
4. Step 4: Simplify right side
   72.64x = 4,611.90
5. Step 5: Solve for x
   x = 4,611.90/72.64
6. Step 6: Final answer
   x = 63.49