Finding the Fourth Proportional to 1,429.75, 2,139.77 and 812.53

Step by Step Solution

1. Step 1: Write the proportion equation
   1,429.75 : 2,139.77 = 812.53 : x
2. Step 2: Convert to fraction form
   1,429.75/2,139.77 = 812.53/x
3. Step 3: Cross multiply
   1,429.75x = 2,139.77 × 812.53
4. Step 4: Simplify right side
   1,429.75x = 1,738,627.45
5. Step 5: Solve for x
   x = 1,738,627.45/1,429.75
6. Step 6: Final answer
   x = 1,216.03