Finding the Fourth Proportional to 1,485.99, 2,050.89 and 856.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,485.99 : 2,050.89 = 856.40 : x
2. Step 2: Convert to fraction form
   1,485.99/2,050.89 = 856.40/x
3. Step 3: Cross multiply
   1,485.99x = 2,050.89 × 856.40
4. Step 4: Simplify right side
   1,485.99x = 1,756,382.20
5. Step 5: Solve for x
   x = 1,756,382.20/1,485.99
6. Step 6: Final answer
   x = 1,181.96