Finding the Fourth Proportional to 648,452.72, 894,707.16 and 380,128.88

Step by Step Solution

1. Step 1: Write the proportion equation
   648,452.72 : 894,707.16 = 380,128.88 : x
2. Step 2: Convert to fraction form
   648,452.72/894,707.16 = 380,128.88/x
3. Step 3: Cross multiply
   648,452.72x = 894,707.16 × 380,128.88
4. Step 4: Simplify right side
   648,452.72x = 340,104,030,658.78
5. Step 5: Solve for x
   x = 340,104,030,658.78/648,452.72
6. Step 6: Final answer
   x = 524,485.47