Finding the Fourth Proportional to 72.91, 109.40 and 45.88

Step by Step Solution

1. Step 1: Write the proportion equation
   72.91 : 109.40 = 45.88 : x
2. Step 2: Convert to fraction form
   72.91/109.40 = 45.88/x
3. Step 3: Cross multiply
   72.91x = 109.40 × 45.88
4. Step 4: Simplify right side
   72.91x = 5,019.27
5. Step 5: Solve for x
   x = 5,019.27/72.91
6. Step 6: Final answer
   x = 68.84