Finding the Fourth Proportional to 498.89, 748.20 and 190.91

Step by Step Solution

1. Step 1: Write the proportion equation
   498.89 : 748.20 = 190.91 : x
2. Step 2: Convert to fraction form
   498.89/748.20 = 190.91/x
3. Step 3: Cross multiply
   498.89x = 748.20 × 190.91
4. Step 4: Simplify right side
   498.89x = 142,838.86
5. Step 5: Solve for x
   x = 142,838.86/498.89
6. Step 6: Final answer
   x = 286.31