Finding the Fourth Proportional to 1,430.91, 2,142.71 and 698.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,430.91 : 2,142.71 = 698.57 : x
2. Step 2: Convert to fraction form
   1,430.91/2,142.71 = 698.57/x
3. Step 3: Cross multiply
   1,430.91x = 2,142.71 × 698.57
4. Step 4: Simplify right side
   1,430.91x = 1,496,822.21
5. Step 5: Solve for x
   x = 1,496,822.21/1,430.91
6. Step 6: Final answer
   x = 1,046.07