Finding the Fourth Proportional to 1,431.98, 2,145.12 and 699.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,431.98 : 2,145.12 = 699.34 : x
2. Step 2: Convert to fraction form
   1,431.98/2,145.12 = 699.34/x
3. Step 3: Cross multiply
   1,431.98x = 2,145.12 × 699.34
4. Step 4: Simplify right side
   1,431.98x = 1,500,168.22
5. Step 5: Solve for x
   x = 1,500,168.22/1,431.98
6. Step 6: Final answer
   x = 1,047.62