Finding the Fourth Proportional to 1,276.32, 1,914.72 and 659.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,276.32 : 1,914.72 = 659.76 : x
2. Step 2: Convert to fraction form
   1,276.32/1,914.72 = 659.76/x
3. Step 3: Cross multiply
   1,276.32x = 1,914.72 × 659.76
4. Step 4: Simplify right side
   1,276.32x = 1,263,255.67
5. Step 5: Solve for x
   x = 1,263,255.67/1,276.32
6. Step 6: Final answer
   x = 989.76