Finding the Fourth Proportional to 1,231.06, 1,698.86 and 671.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,231.06 : 1,698.86 = 671.52 : x
2. Step 2: Convert to fraction form
   1,231.06/1,698.86 = 671.52/x
3. Step 3: Cross multiply
   1,231.06x = 1,698.86 × 671.52
4. Step 4: Simplify right side
   1,231.06x = 1,140,810.86
5. Step 5: Solve for x
   x = 1,140,810.86/1,231.06
6. Step 6: Final answer
   x = 926.69