Finding the Fourth Proportional to 2,160.01, 2,980.97 and 1,228.51

Step by Step Solution

1. Step 1: Write the proportion equation
   2,160.01 : 2,980.97 = 1,228.51 : x
2. Step 2: Convert to fraction form
   2,160.01/2,980.97 = 1,228.51/x
3. Step 3: Cross multiply
   2,160.01x = 2,980.97 × 1,228.51
4. Step 4: Simplify right side
   2,160.01x = 3,662,151.45
5. Step 5: Solve for x
   x = 3,662,151.45/2,160.01
6. Step 6: Final answer
   x = 1,695.43