Finding the Fourth Proportional to 93.38, 128.83 and 56.53

Step by Step Solution

1. Step 1: Write the proportion equation
   93.38 : 128.83 = 56.53 : x
2. Step 2: Convert to fraction form
   93.38/128.83 = 56.53/x
3. Step 3: Cross multiply
   93.38x = 128.83 × 56.53
4. Step 4: Simplify right side
   93.38x = 7,282.58
5. Step 5: Solve for x
   x = 7,282.58/93.38
6. Step 6: Final answer
   x = 77.99