Finding the Fourth Proportional to 1,866.12, 2,796.89 and 1,086.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,866.12 : 2,796.89 = 1,086.50 : x
2. Step 2: Convert to fraction form
   1,866.12/2,796.89 = 1,086.50/x
3. Step 3: Cross multiply
   1,866.12x = 2,796.89 × 1,086.50
4. Step 4: Simplify right side
   1,866.12x = 3,038,801.57
5. Step 5: Solve for x
   x = 3,038,801.57/1,866.12
6. Step 6: Final answer
   x = 1,628.41