Finding the Fourth Proportional to 1,428.63, 2,141.96 and 698.79

Step by Step Solution

1. Step 1: Write the proportion equation
   1,428.63 : 2,141.96 = 698.79 : x
2. Step 2: Convert to fraction form
   1,428.63/2,141.96 = 698.79/x
3. Step 3: Cross multiply
   1,428.63x = 2,141.96 × 698.79
4. Step 4: Simplify right side
   1,428.63x = 1,496,776.73
5. Step 5: Solve for x
   x = 1,496,776.73/1,428.63
6. Step 6: Final answer
   x = 1,047.70