Finding the Fourth Proportional to 78.79, 108.72 and 45.60

Step by Step Solution

1. Step 1: Write the proportion equation
   78.79 : 108.72 = 45.60 : x
2. Step 2: Convert to fraction form
   78.79/108.72 = 45.60/x
3. Step 3: Cross multiply
   78.79x = 108.72 × 45.60
4. Step 4: Simplify right side
   78.79x = 4,957.63
5. Step 5: Solve for x
   x = 4,957.63/78.79
6. Step 6: Final answer
   x = 62.92