Finding the Fourth Proportional to 680,386.72, 938,874 and 378,597.28

Step by Step Solution

1. Step 1: Write the proportion equation
   680,386.72 : 938,874 = 378,597.28 : x
2. Step 2: Convert to fraction form
   680,386.72/938,874 = 378,597.28/x
3. Step 3: Cross multiply
   680,386.72x = 938,874 × 378,597.28
4. Step 4: Simplify right side
   680,386.72x = 355,455,142,662.72
5. Step 5: Solve for x
   x = 355,455,142,662.72/680,386.72
6. Step 6: Final answer
   x = 522,431.04