Finding the Fourth Proportional to 1,429.21, 2,145.16 and 726.92

Step by Step Solution

1. Step 1: Write the proportion equation
   1,429.21 : 2,145.16 = 726.92 : x
2. Step 2: Convert to fraction form
   1,429.21/2,145.16 = 726.92/x
3. Step 3: Cross multiply
   1,429.21x = 2,145.16 × 726.92
4. Step 4: Simplify right side
   1,429.21x = 1,559,359.71
5. Step 5: Solve for x
   x = 1,559,359.71/1,429.21
6. Step 6: Final answer
   x = 1,091.06