Finding the Fourth Proportional to 1,087.36, 1,630.28 and 346.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,087.36 : 1,630.28 = 346.72 : x
2. Step 2: Convert to fraction form
   1,087.36/1,630.28 = 346.72/x
3. Step 3: Cross multiply
   1,087.36x = 1,630.28 × 346.72
4. Step 4: Simplify right side
   1,087.36x = 565,253.16
5. Step 5: Solve for x
   x = 565,253.16/1,087.36
6. Step 6: Final answer
   x = 519.84