Finding the Fourth Proportional to 78.75, 117.99 and 49.89

Step by Step Solution

1. Step 1: Write the proportion equation
   78.75 : 117.99 = 49.89 : x
2. Step 2: Convert to fraction form
   78.75/117.99 = 49.89/x
3. Step 3: Cross multiply
   78.75x = 117.99 × 49.89
4. Step 4: Simplify right side
   78.75x = 5,887.10
5. Step 5: Solve for x
   x = 5,887.10/78.75
6. Step 6: Final answer
   x = 74.76