Finding the Fourth Proportional to 1,210.98, 1,671.72 and 713.46

Step by Step Solution

1. Step 1: Write the proportion equation
   1,210.98 : 1,671.72 = 713.46 : x
2. Step 2: Convert to fraction form
   1,210.98/1,671.72 = 713.46/x
3. Step 3: Cross multiply
   1,210.98x = 1,671.72 × 713.46
4. Step 4: Simplify right side
   1,210.98x = 1,192,705.35
5. Step 5: Solve for x
   x = 1,192,705.35/1,210.98
6. Step 6: Final answer
   x = 984.91