Finding the Fourth Proportional to 1,429.52, 2,139.28 and 811.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,429.52 : 2,139.28 = 811.52 : x
2. Step 2: Convert to fraction form
   1,429.52/2,139.28 = 811.52/x
3. Step 3: Cross multiply
   1,429.52x = 2,139.28 × 811.52
4. Step 4: Simplify right side
   1,429.52x = 1,736,068.51
5. Step 5: Solve for x
   x = 1,736,068.51/1,429.52
6. Step 6: Final answer
   x = 1,214.44