Finding the Fourth Proportional to 830.01, 1,144.72 and 498.20

Step by Step Solution

1. Step 1: Write the proportion equation
   830.01 : 1,144.72 = 498.20 : x
2. Step 2: Convert to fraction form
   830.01/1,144.72 = 498.20/x
3. Step 3: Cross multiply
   830.01x = 1,144.72 × 498.20
4. Step 4: Simplify right side
   830.01x = 570,293.00
5. Step 5: Solve for x
   x = 570,293.00/830.01
6. Step 6: Final answer
   x = 687.10