Finding the Fourth Proportional to 1,245.01, 1,865.86 and 659.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,245.01 : 1,865.86 = 659.89 : x
2. Step 2: Convert to fraction form
   1,245.01/1,865.86 = 659.89/x
3. Step 3: Cross multiply
   1,245.01x = 1,865.86 × 659.89
4. Step 4: Simplify right side
   1,245.01x = 1,231,262.36
5. Step 5: Solve for x
   x = 1,231,262.36/1,245.01
6. Step 6: Final answer
   x = 988.96