Finding the Fourth Proportional to 1,869.87, 2,580.63 and 1,403.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,869.87 : 2,580.63 = 1,403.31 : x
2. Step 2: Convert to fraction form
   1,869.87/2,580.63 = 1,403.31/x
3. Step 3: Cross multiply
   1,869.87x = 2,580.63 × 1,403.31
4. Step 4: Simplify right side
   1,869.87x = 3,621,423.89
5. Step 5: Solve for x
   x = 3,621,423.89/1,869.87
6. Step 6: Final answer
   x = 1,936.72