Finding the Fourth Proportional to 1,440.67, 1,988.15 and 802.63

Step by Step Solution

1. Step 1: Write the proportion equation
   1,440.67 : 1,988.15 = 802.63 : x
2. Step 2: Convert to fraction form
   1,440.67/1,988.15 = 802.63/x
3. Step 3: Cross multiply
   1,440.67x = 1,988.15 × 802.63
4. Step 4: Simplify right side
   1,440.67x = 1,595,738.89
5. Step 5: Solve for x
   x = 1,595,738.89/1,440.67
6. Step 6: Final answer
   x = 1,107.64