Finding the Fourth Proportional to 34,128.72, 51,144.12 and 30,439.44

Step by Step Solution

1. Step 1: Write the proportion equation
   34,128.72 : 51,144.12 = 30,439.44 : x
2. Step 2: Convert to fraction form
   34,128.72/51,144.12 = 30,439.44/x
3. Step 3: Cross multiply
   34,128.72x = 51,144.12 × 30,439.44
4. Step 4: Simplify right side
   34,128.72x = 1,556,798,372.09
5. Step 5: Solve for x
   x = 1,556,798,372.09/34,128.72
6. Step 6: Final answer
   x = 45,615.49