Finding the Fourth Proportional to 610,128.72, 915,683.94 and 344,145.78

Step by Step Solution

1. Step 1: Write the proportion equation
   610,128.72 : 915,683.94 = 344,145.78 : x
2. Step 2: Convert to fraction form
   610,128.72/915,683.94 = 344,145.78/x
3. Step 3: Cross multiply
   610,128.72x = 915,683.94 × 344,145.78
4. Step 4: Simplify right side
   610,128.72x = 315,128,763,764.77
5. Step 5: Solve for x
   x = 315,128,763,764.77/610,128.72
6. Step 6: Final answer
   x = 516,495.54