Finding the Fourth Proportional to 1,621.48, 2,238.66 and 1,123.94

Step by Step Solution

1. Step 1: Write the proportion equation
   1,621.48 : 2,238.66 = 1,123.94 : x
2. Step 2: Convert to fraction form
   1,621.48/2,238.66 = 1,123.94/x
3. Step 3: Cross multiply
   1,621.48x = 2,238.66 × 1,123.94
4. Step 4: Simplify right side
   1,621.48x = 2,516,119.52
5. Step 5: Solve for x
   x = 2,516,119.52/1,621.48
6. Step 6: Final answer
   x = 1,551.74