Finding the Fourth Proportional to 1,909.31, 2,859.91 and 1,087.16

Step by Step Solution

1. Step 1: Write the proportion equation
   1,909.31 : 2,859.91 = 1,087.16 : x
2. Step 2: Convert to fraction form
   1,909.31/2,859.91 = 1,087.16/x
3. Step 3: Cross multiply
   1,909.31x = 2,859.91 × 1,087.16
4. Step 4: Simplify right side
   1,909.31x = 3,109,179.76
5. Step 5: Solve for x
   x = 3,109,179.76/1,909.31
6. Step 6: Final answer
   x = 1,628.43