Finding the Fourth Proportional to 1,431.43, 1,975.20 and 801.99

Step by Step Solution

1. Step 1: Write the proportion equation
   1,431.43 : 1,975.20 = 801.99 : x
2. Step 2: Convert to fraction form
   1,431.43/1,975.20 = 801.99/x
3. Step 3: Cross multiply
   1,431.43x = 1,975.20 × 801.99
4. Step 4: Simplify right side
   1,431.43x = 1,584,090.65
5. Step 5: Solve for x
   x = 1,584,090.65/1,431.43
6. Step 6: Final answer
   x = 1,106.65