Finding the Fourth Proportional to 680,986.78, 939,724.86 and 375,003.34

Step by Step Solution

1. Step 1: Write the proportion equation
   680,986.78 : 939,724.86 = 375,003.34 : x
2. Step 2: Convert to fraction form
   680,986.78/939,724.86 = 375,003.34/x
3. Step 3: Cross multiply
   680,986.78x = 939,724.86 × 375,003.34
4. Step 4: Simplify right side
   680,986.78x = 352,399,954,607.39
5. Step 5: Solve for x
   x = 352,399,954,607.39/680,986.78
6. Step 6: Final answer
   x = 517,484.29