Finding the Fourth Proportional to 3,428.56, 5,145.72 and 2,748.88

Step by Step Solution

1. Step 1: Write the proportion equation
   3,428.56 : 5,145.72 = 2,748.88 : x
2. Step 2: Convert to fraction form
   3,428.56/5,145.72 = 2,748.88/x
3. Step 3: Cross multiply
   3,428.56x = 5,145.72 × 2,748.88
4. Step 4: Simplify right side
   3,428.56x = 14,144,966.79
5. Step 5: Solve for x
   x = 14,144,966.79/3,428.56
6. Step 6: Final answer
   x = 4,125.63