Finding the Fourth Proportional to 1,086.62, 1,630.86 and 437.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,086.62 : 1,630.86 = 437.82 : x
2. Step 2: Convert to fraction form
   1,086.62/1,630.86 = 437.82/x
3. Step 3: Cross multiply
   1,086.62x = 1,630.86 × 437.82
4. Step 4: Simplify right side
   1,086.62x = 714,023.13
5. Step 5: Solve for x
   x = 714,023.13/1,086.62
6. Step 6: Final answer
   x = 657.10