Finding the Fourth Proportional to 1,230.69, 1,698.28 and 706.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,230.69 : 1,698.28 = 706.72 : x
2. Step 2: Convert to fraction form
   1,230.69/1,698.28 = 706.72/x
3. Step 3: Cross multiply
   1,230.69x = 1,698.28 × 706.72
4. Step 4: Simplify right side
   1,230.69x = 1,200,201.83
5. Step 5: Solve for x
   x = 1,200,201.83/1,230.69
6. Step 6: Final answer
   x = 975.23