Finding the Fourth Proportional to 2,912.65, 4,369.78 and 1,615.03

Step by Step Solution

1. Step 1: Write the proportion equation
   2,912.65 : 4,369.78 = 1,615.03 : x
2. Step 2: Convert to fraction form
   2,912.65/4,369.78 = 1,615.03/x
3. Step 3: Cross multiply
   2,912.65x = 4,369.78 × 1,615.03
4. Step 4: Simplify right side
   2,912.65x = 7,057,316.89
5. Step 5: Solve for x
   x = 7,057,316.89/2,912.65
6. Step 6: Final answer
   x = 2,422.99