Finding the Fourth Proportional to 1,640.50, 2,460.72 and 665.93

Step by Step Solution

1. Step 1: Write the proportion equation
   1,640.50 : 2,460.72 = 665.93 : x
2. Step 2: Convert to fraction form
   1,640.50/2,460.72 = 665.93/x
3. Step 3: Cross multiply
   1,640.50x = 2,460.72 × 665.93
4. Step 4: Simplify right side
   1,640.50x = 1,638,667.27
5. Step 5: Solve for x
   x = 1,638,667.27/1,640.50
6. Step 6: Final answer
   x = 998.88