Finding the Fourth Proportional to 1,307.76, 1,962.72 and 658.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,307.76 : 1,962.72 = 658.56 : x
2. Step 2: Convert to fraction form
   1,307.76/1,962.72 = 658.56/x
3. Step 3: Cross multiply
   1,307.76x = 1,962.72 × 658.56
4. Step 4: Simplify right side
   1,307.76x = 1,292,568.88
5. Step 5: Solve for x
   x = 1,292,568.88/1,307.76
6. Step 6: Final answer
   x = 988.38