Finding the Fourth Proportional to 2,160, 2,980.94 and 1,228.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,160 : 2,980.94 = 1,228.50 : x
2. Step 2: Convert to fraction form
   2,160/2,980.94 = 1,228.50/x
3. Step 3: Cross multiply
   2,160x = 2,980.94 × 1,228.50
4. Step 4: Simplify right side
   2,160x = 3,662,078.65
5. Step 5: Solve for x
   x = 3,662,078.65/2,160
6. Step 6: Final answer
   x = 1,695.41