Finding the Fourth Proportional to 2,154.72, 2,973.72 and 1,223.28

Step by Step Solution

1. Step 1: Write the proportion equation
   2,154.72 : 2,973.72 = 1,223.28 : x
2. Step 2: Convert to fraction form
   2,154.72/2,973.72 = 1,223.28/x
3. Step 3: Cross multiply
   2,154.72x = 2,973.72 × 1,223.28
4. Step 4: Simplify right side
   2,154.72x = 3,637,692.20
5. Step 5: Solve for x
   x = 3,637,692.20/2,154.72
6. Step 6: Final answer
   x = 1,688.24