Finding the Fourth Proportional to 1,429.79, 2,142.47 and 699.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,429.79 : 2,142.47 = 699.86 : x
2. Step 2: Convert to fraction form
   1,429.79/2,142.47 = 699.86/x
3. Step 3: Cross multiply
   1,429.79x = 2,142.47 × 699.86
4. Step 4: Simplify right side
   1,429.79x = 1,499,436.16
5. Step 5: Solve for x
   x = 1,499,436.16/1,429.79
6. Step 6: Final answer
   x = 1,048.71