Finding the Fourth Proportional to 2,128.62, 2,940.12 and 1,538.22

Step by Step Solution

1. Step 1: Write the proportion equation
   2,128.62 : 2,940.12 = 1,538.22 : x
2. Step 2: Convert to fraction form
   2,128.62/2,940.12 = 1,538.22/x
3. Step 3: Cross multiply
   2,128.62x = 2,940.12 × 1,538.22
4. Step 4: Simplify right side
   2,128.62x = 4,522,551.39
5. Step 5: Solve for x
   x = 4,522,551.39/2,128.62
6. Step 6: Final answer
   x = 2,124.64