Finding the Fourth Proportional to 78.87, 108.82 and 53.98

Step by Step Solution

1. Step 1: Write the proportion equation
   78.87 : 108.82 = 53.98 : x
2. Step 2: Convert to fraction form
   78.87/108.82 = 53.98/x
3. Step 3: Cross multiply
   78.87x = 108.82 × 53.98
4. Step 4: Simplify right side
   78.87x = 5,873.90
5. Step 5: Solve for x
   x = 5,873.90/78.87
6. Step 6: Final answer
   x = 74.47