Finding the Fourth Proportional to 1,802.43, 2,487.33 and 1,005.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,802.43 : 2,487.33 = 1,005.72 : x
2. Step 2: Convert to fraction form
   1,802.43/2,487.33 = 1,005.72/x
3. Step 3: Cross multiply
   1,802.43x = 2,487.33 × 1,005.72
4. Step 4: Simplify right side
   1,802.43x = 2,501,557.53
5. Step 5: Solve for x
   x = 2,501,557.53/1,802.43
6. Step 6: Final answer
   x = 1,387.88