Finding the Fourth Proportional to 78.75, 108.72 and 56.93

Step by Step Solution

1. Step 1: Write the proportion equation
   78.75 : 108.72 = 56.93 : x
2. Step 2: Convert to fraction form
   78.75/108.72 = 56.93/x
3. Step 3: Cross multiply
   78.75x = 108.72 × 56.93
4. Step 4: Simplify right side
   78.75x = 6,188.89
5. Step 5: Solve for x
   x = 6,188.89/78.75
6. Step 6: Final answer
   x = 78.59