Finding the Fourth Proportional to 127.57, 175.99 and 78.43

Step by Step Solution

1. Step 1: Write the proportion equation
   127.57 : 175.99 = 78.43 : x
2. Step 2: Convert to fraction form
   127.57/175.99 = 78.43/x
3. Step 3: Cross multiply
   127.57x = 175.99 × 78.43
4. Step 4: Simplify right side
   127.57x = 13,802.50
5. Step 5: Solve for x
   x = 13,802.50/127.57
6. Step 6: Final answer
   x = 108.20