Finding the Fourth Proportional to 1,429.84, 2,145.57 and 851.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,429.84 : 2,145.57 = 851.50 : x
2. Step 2: Convert to fraction form
   1,429.84/2,145.57 = 851.50/x
3. Step 3: Cross multiply
   1,429.84x = 2,145.57 × 851.50
4. Step 4: Simplify right side
   1,429.84x = 1,826,952.86
5. Step 5: Solve for x
   x = 1,826,952.86/1,429.84
6. Step 6: Final answer
   x = 1,277.73