Finding the Fourth Proportional to 79.10, 109.15 and 45.91

Step by Step Solution

1. Step 1: Write the proportion equation
   79.10 : 109.15 = 45.91 : x
2. Step 2: Convert to fraction form
   79.10/109.15 = 45.91/x
3. Step 3: Cross multiply
   79.10x = 109.15 × 45.91
4. Step 4: Simplify right side
   79.10x = 5,010.89
5. Step 5: Solve for x
   x = 5,010.89/79.10
6. Step 6: Final answer
   x = 63.35