Finding the Fourth Proportional to 1,210.52, 1,815.72 and 344.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,210.52 : 1,815.72 = 344.72 : x
2. Step 2: Convert to fraction form
   1,210.52/1,815.72 = 344.72/x
3. Step 3: Cross multiply
   1,210.52x = 1,815.72 × 344.72
4. Step 4: Simplify right side
   1,210.52x = 625,915.00
5. Step 5: Solve for x
   x = 625,915.00/1,210.52
6. Step 6: Final answer
   x = 517.06