Finding the Fourth Proportional to 1,431.30, 1,975.17 and 801.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,431.30 : 1,975.17 = 801.78 : x
2. Step 2: Convert to fraction form
   1,431.30/1,975.17 = 801.78/x
3. Step 3: Cross multiply
   1,431.30x = 1,975.17 × 801.78
4. Step 4: Simplify right side
   1,431.30x = 1,583,651.80
5. Step 5: Solve for x
   x = 1,583,651.80/1,431.30
6. Step 6: Final answer
   x = 1,106.44