Finding the Fourth Proportional to 1,440.45, 1,987.92 and 802.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,440.45 : 1,987.92 = 802.50 : x
2. Step 2: Convert to fraction form
   1,440.45/1,987.92 = 802.50/x
3. Step 3: Cross multiply
   1,440.45x = 1,987.92 × 802.50
4. Step 4: Simplify right side
   1,440.45x = 1,595,299.47
5. Step 5: Solve for x
   x = 1,595,299.47/1,440.45
6. Step 6: Final answer
   x = 1,107.50