Finding the Fourth Proportional to 1,429.26, 2,145.63 and 813.45

Step by Step Solution

1. Step 1: Write the proportion equation
   1,429.26 : 2,145.63 = 813.45 : x
2. Step 2: Convert to fraction form
   1,429.26/2,145.63 = 813.45/x
3. Step 3: Cross multiply
   1,429.26x = 2,145.63 × 813.45
4. Step 4: Simplify right side
   1,429.26x = 1,745,362.72
5. Step 5: Solve for x
   x = 1,745,362.72/1,429.26
6. Step 6: Final answer
   x = 1,221.17