Finding the Fourth Proportional to 90.72, 136.14 and 56.52

Step by Step Solution

1. Step 1: Write the proportion equation
   90.72 : 136.14 = 56.52 : x
2. Step 2: Convert to fraction form
   90.72/136.14 = 56.52/x
3. Step 3: Cross multiply
   90.72x = 136.14 × 56.52
4. Step 4: Simplify right side
   90.72x = 7,694.63
5. Step 5: Solve for x
   x = 7,694.63/90.72
6. Step 6: Final answer
   x = 84.82