Finding the Fourth Proportional to 2,120.01, 3,180.56 and 659.18

Step by Step Solution

1. Step 1: Write the proportion equation
   2,120.01 : 3,180.56 = 659.18 : x
2. Step 2: Convert to fraction form
   2,120.01/3,180.56 = 659.18/x
3. Step 3: Cross multiply
   2,120.01x = 3,180.56 × 659.18
4. Step 4: Simplify right side
   2,120.01x = 2,096,542.34
5. Step 5: Solve for x
   x = 2,096,542.34/2,120.01
6. Step 6: Final answer
   x = 988.93