Finding the Fourth Proportional to 999.09, 1,498.69 and 340.69

Step by Step Solution

1. Step 1: Write the proportion equation
   999.09 : 1,498.69 = 340.69 : x
2. Step 2: Convert to fraction form
   999.09/1,498.69 = 340.69/x
3. Step 3: Cross multiply
   999.09x = 1,498.69 × 340.69
4. Step 4: Simplify right side
   999.09x = 510,589.55
5. Step 5: Solve for x
   x = 510,589.55/999.09
6. Step 6: Final answer
   x = 511.06