Finding the Fourth Proportional to 613,435.78, 920,341.46 and 314,128.28

Step by Step Solution

1. Step 1: Write the proportion equation
   613,435.78 : 920,341.46 = 314,128.28 : x
2. Step 2: Convert to fraction form
   613,435.78/920,341.46 = 314,128.28/x
3. Step 3: Cross multiply
   613,435.78x = 920,341.46 × 314,128.28
4. Step 4: Simplify right side
   613,435.78x = 289,105,276,026.10
5. Step 5: Solve for x
   x = 289,105,276,026.10/613,435.78
6. Step 6: Final answer
   x = 471,288.58