Finding the Fourth Proportional to 72.53, 108.71 and 45.10

Step by Step Solution

1. Step 1: Write the proportion equation
   72.53 : 108.71 = 45.10 : x
2. Step 2: Convert to fraction form
   72.53/108.71 = 45.10/x
3. Step 3: Cross multiply
   72.53x = 108.71 × 45.10
4. Step 4: Simplify right side
   72.53x = 4,903.34
5. Step 5: Solve for x
   x = 4,903.34/72.53
6. Step 6: Final answer
   x = 67.61