Finding the Fourth Proportional to 1,428.32, 2,142.52 and 698.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,428.32 : 2,142.52 = 698.48 : x
2. Step 2: Convert to fraction form
   1,428.32/2,142.52 = 698.48/x
3. Step 3: Cross multiply
   1,428.32x = 2,142.52 × 698.48
4. Step 4: Simplify right side
   1,428.32x = 1,496,507.37
5. Step 5: Solve for x
   x = 1,496,507.37/1,428.32
6. Step 6: Final answer
   x = 1,047.74