Finding the Fourth Proportional to 93.33, 128.78 and 55.98

Step by Step Solution

1. Step 1: Write the proportion equation
   93.33 : 128.78 = 55.98 : x
2. Step 2: Convert to fraction form
   93.33/128.78 = 55.98/x
3. Step 3: Cross multiply
   93.33x = 128.78 × 55.98
4. Step 4: Simplify right side
   93.33x = 7,209.10
5. Step 5: Solve for x
   x = 7,209.10/93.33
6. Step 6: Final answer
   x = 77.25