Finding the Fourth Proportional to 1,431.68, 1,975.68 and 802.24

Step by Step Solution

1. Step 1: Write the proportion equation
   1,431.68 : 1,975.68 = 802.24 : x
2. Step 2: Convert to fraction form
   1,431.68/1,975.68 = 802.24/x
3. Step 3: Cross multiply
   1,431.68x = 1,975.68 × 802.24
4. Step 4: Simplify right side
   1,431.68x = 1,584,964.58
5. Step 5: Solve for x
   x = 1,584,964.58/1,431.68
6. Step 6: Final answer
   x = 1,107.07