Finding the Fourth Proportional to 2,181.59, 3,009.07 and 1,435.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,181.59 : 3,009.07 = 1,435.31 : x
2. Step 2: Convert to fraction form
   2,181.59/3,009.07 = 1,435.31/x
3. Step 3: Cross multiply
   2,181.59x = 3,009.07 × 1,435.31
4. Step 4: Simplify right side
   2,181.59x = 4,318,948.26
5. Step 5: Solve for x
   x = 4,318,948.26/2,181.59
6. Step 6: Final answer
   x = 1,979.72