Finding the Fourth Proportional to 2,154.78, 2,973.57 and 1,223.22

Step by Step Solution

1. Step 1: Write the proportion equation
   2,154.78 : 2,973.57 = 1,223.22 : x
2. Step 2: Convert to fraction form
   2,154.78/2,973.57 = 1,223.22/x
3. Step 3: Cross multiply
   2,154.78x = 2,973.57 × 1,223.22
4. Step 4: Simplify right side
   2,154.78x = 3,637,330.30
5. Step 5: Solve for x
   x = 3,637,330.30/2,154.78
6. Step 6: Final answer
   x = 1,688.03