Finding the Fourth Proportional to 498.61, 747.78 and 190.41

Step by Step Solution

1. Step 1: Write the proportion equation
   498.61 : 747.78 = 190.41 : x
2. Step 2: Convert to fraction form
   498.61/747.78 = 190.41/x
3. Step 3: Cross multiply
   498.61x = 747.78 × 190.41
4. Step 4: Simplify right side
   498.61x = 142,384.79
5. Step 5: Solve for x
   x = 142,384.79/498.61
6. Step 6: Final answer
   x = 285.56