Finding the Fourth Proportional to 2,139.46, 3,220.56 and 1,527.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,139.46 : 3,220.56 = 1,527.40 : x
2. Step 2: Convert to fraction form
   2,139.46/3,220.56 = 1,527.40/x
3. Step 3: Cross multiply
   2,139.46x = 3,220.56 × 1,527.40
4. Step 4: Simplify right side
   2,139.46x = 4,919,083.34
5. Step 5: Solve for x
   x = 4,919,083.34/2,139.46
6. Step 6: Final answer
   x = 2,299.22