Finding the Fourth Proportional to 1,429.10, 2,140.80 and 696.45

Step by Step Solution

1. Step 1: Write the proportion equation
   1,429.10 : 2,140.80 = 696.45 : x
2. Step 2: Convert to fraction form
   1,429.10/2,140.80 = 696.45/x
3. Step 3: Cross multiply
   1,429.10x = 2,140.80 × 696.45
4. Step 4: Simplify right side
   1,429.10x = 1,490,960.16
5. Step 5: Solve for x
   x = 1,490,960.16/1,429.10
6. Step 6: Final answer
   x = 1,043.29