Finding the Fourth Proportional to 2,150.56, 3,225.88 and 611.60

Step by Step Solution

1. Step 1: Write the proportion equation
   2,150.56 : 3,225.88 = 611.60 : x
2. Step 2: Convert to fraction form
   2,150.56/3,225.88 = 611.60/x
3. Step 3: Cross multiply
   2,150.56x = 3,225.88 × 611.60
4. Step 4: Simplify right side
   2,150.56x = 1,972,948.21
5. Step 5: Solve for x
   x = 1,972,948.21/2,150.56
6. Step 6: Final answer
   x = 917.41