Finding the Fourth Proportional to 103.15, 142.34 and 56.52

Step by Step Solution

1. Step 1: Write the proportion equation
   103.15 : 142.34 = 56.52 : x
2. Step 2: Convert to fraction form
   103.15/142.34 = 56.52/x
3. Step 3: Cross multiply
   103.15x = 142.34 × 56.52
4. Step 4: Simplify right side
   103.15x = 8,044.82
5. Step 5: Solve for x
   x = 8,044.82/103.15
6. Step 6: Final answer
   x = 77.99