Finding the Fourth Proportional to 2,129.12, 2,940.81 and 1,538.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,129.12 : 2,940.81 = 1,538.72 : x
2. Step 2: Convert to fraction form
   2,129.12/2,940.81 = 1,538.72/x
3. Step 3: Cross multiply
   2,129.12x = 2,940.81 × 1,538.72
4. Step 4: Simplify right side
   2,129.12x = 4,525,083.16
5. Step 5: Solve for x
   x = 4,525,083.16/2,129.12
6. Step 6: Final answer
   x = 2,125.33