Finding the Fourth Proportional to 2,168.28, 2,992.68 and 1,539.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,168.28 : 2,992.68 = 1,539.72 : x
2. Step 2: Convert to fraction form
   2,168.28/2,992.68 = 1,539.72/x
3. Step 3: Cross multiply
   2,168.28x = 2,992.68 × 1,539.72
4. Step 4: Simplify right side
   2,168.28x = 4,607,889.25
5. Step 5: Solve for x
   x = 4,607,889.25/2,168.28
6. Step 6: Final answer
   x = 2,125.14