Finding the Fourth Proportional to 2,070.45, 3,105.89 and 664.37

Step by Step Solution

1. Step 1: Write the proportion equation
   2,070.45 : 3,105.89 = 664.37 : x
2. Step 2: Convert to fraction form
   2,070.45/3,105.89 = 664.37/x
3. Step 3: Cross multiply
   2,070.45x = 3,105.89 × 664.37
4. Step 4: Simplify right side
   2,070.45x = 2,063,455.43
5. Step 5: Solve for x
   x = 2,063,455.43/2,070.45
6. Step 6: Final answer
   x = 996.62