Finding the Fourth Proportional to 1,404.82, 2,109.26 and 858.07

Step by Step Solution

1. Step 1: Write the proportion equation
   1,404.82 : 2,109.26 = 858.07 : x
2. Step 2: Convert to fraction form
   1,404.82/2,109.26 = 858.07/x
3. Step 3: Cross multiply
   1,404.82x = 2,109.26 × 858.07
4. Step 4: Simplify right side
   1,404.82x = 1,809,892.73
5. Step 5: Solve for x
   x = 1,809,892.73/1,404.82
6. Step 6: Final answer
   x = 1,288.34