Finding the Fourth Proportional to 498.72, 747.88 and 190.57

Step by Step Solution

1. Step 1: Write the proportion equation
   498.72 : 747.88 = 190.57 : x
2. Step 2: Convert to fraction form
   498.72/747.88 = 190.57/x
3. Step 3: Cross multiply
   498.72x = 747.88 × 190.57
4. Step 4: Simplify right side
   498.72x = 142,523.49
5. Step 5: Solve for x
   x = 142,523.49/498.72
6. Step 6: Final answer
   x = 285.78