Finding the Fourth Proportional to 1,207.98, 1,667.28 and 684.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,207.98 : 1,667.28 = 684.18 : x
2. Step 2: Convert to fraction form
   1,207.98/1,667.28 = 684.18/x
3. Step 3: Cross multiply
   1,207.98x = 1,667.28 × 684.18
4. Step 4: Simplify right side
   1,207.98x = 1,140,719.63
5. Step 5: Solve for x
   x = 1,140,719.63/1,207.98
6. Step 6: Final answer
   x = 944.32