Finding the Fourth Proportional to 1,314.77, 1,970.12 and 664.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,314.77 : 1,970.12 = 664.34 : x
2. Step 2: Convert to fraction form
   1,314.77/1,970.12 = 664.34/x
3. Step 3: Cross multiply
   1,314.77x = 1,970.12 × 664.34
4. Step 4: Simplify right side
   1,314.77x = 1,308,821.33
5. Step 5: Solve for x
   x = 1,308,821.33/1,314.77
6. Step 6: Final answer
   x = 995.48