Finding the Fourth Proportional to 407,404.69, 562,321.82 and 278,395.38

Step by Step Solution

1. Step 1: Write the proportion equation
   407,404.69 : 562,321.82 = 278,395.38 : x
2. Step 2: Convert to fraction form
   407,404.69/562,321.82 = 278,395.38/x
3. Step 3: Cross multiply
   407,404.69x = 562,321.82 × 278,395.38
4. Step 4: Simplify right side
   407,404.69x = 156,547,796,761.19
5. Step 5: Solve for x
   x = 156,547,796,761.19/407,404.69
6. Step 6: Final answer
   x = 384,256.25