Finding the Fourth Proportional to 1,210.02, 1,669.83 and 685.95

Step by Step Solution

1. Step 1: Write the proportion equation
   1,210.02 : 1,669.83 = 685.95 : x
2. Step 2: Convert to fraction form
   1,210.02/1,669.83 = 685.95/x
3. Step 3: Cross multiply
   1,210.02x = 1,669.83 × 685.95
4. Step 4: Simplify right side
   1,210.02x = 1,145,419.89
5. Step 5: Solve for x
   x = 1,145,419.89/1,210.02
6. Step 6: Final answer
   x = 946.61