Finding the Fourth Proportional to 1,275.58, 1,911.98 and 659.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,275.58 : 1,911.98 = 659.34 : x
2. Step 2: Convert to fraction form
   1,275.58/1,911.98 = 659.34/x
3. Step 3: Cross multiply
   1,275.58x = 1,911.98 × 659.34
4. Step 4: Simplify right side
   1,275.58x = 1,260,644.89
5. Step 5: Solve for x
   x = 1,260,644.89/1,275.58
6. Step 6: Final answer
   x = 988.29