Finding the Fourth Proportional to 2,160.02, 2,980.56 and 1,228.52

Step by Step Solution

1. Step 1: Write the proportion equation
   2,160.02 : 2,980.56 = 1,228.52 : x
2. Step 2: Convert to fraction form
   2,160.02/2,980.56 = 1,228.52/x
3. Step 3: Cross multiply
   2,160.02x = 2,980.56 × 1,228.52
4. Step 4: Simplify right side
   2,160.02x = 3,661,677.57
5. Step 5: Solve for x
   x = 3,661,677.57/2,160.02
6. Step 6: Final answer
   x = 1,695.21