Finding the Fourth Proportional to 1,086.89, 1,630.47 and 356.21

Step by Step Solution

1. Step 1: Write the proportion equation
   1,086.89 : 1,630.47 = 356.21 : x
2. Step 2: Convert to fraction form
   1,086.89/1,630.47 = 356.21/x
3. Step 3: Cross multiply
   1,086.89x = 1,630.47 × 356.21
4. Step 4: Simplify right side
   1,086.89x = 580,789.72
5. Step 5: Solve for x
   x = 580,789.72/1,086.89
6. Step 6: Final answer
   x = 534.36