Finding the Fourth Proportional to 1,116.18, 1,674.45 and 346.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,116.18 : 1,674.45 = 346.50 : x
2. Step 2: Convert to fraction form
   1,116.18/1,674.45 = 346.50/x
3. Step 3: Cross multiply
   1,116.18x = 1,674.45 × 346.50
4. Step 4: Simplify right side
   1,116.18x = 580,196.93
5. Step 5: Solve for x
   x = 580,196.93/1,116.18
6. Step 6: Final answer
   x = 519.81