Finding the Fourth Proportional to 89.02, 133.55 and 56.12

Step by Step Solution

1. Step 1: Write the proportion equation
   89.02 : 133.55 = 56.12 : x
2. Step 2: Convert to fraction form
   89.02/133.55 = 56.12/x
3. Step 3: Cross multiply
   89.02x = 133.55 × 56.12
4. Step 4: Simplify right side
   89.02x = 7,494.83
5. Step 5: Solve for x
   x = 7,494.83/89.02
6. Step 6: Final answer
   x = 84.19