Finding the Fourth Proportional to 630,978.72, 870,087.72 and 415,843.56

Step by Step Solution

1. Step 1: Write the proportion equation
   630,978.72 : 870,087.72 = 415,843.56 : x
2. Step 2: Convert to fraction form
   630,978.72/870,087.72 = 415,843.56/x
3. Step 3: Cross multiply
   630,978.72x = 870,087.72 × 415,843.56
4. Step 4: Simplify right side
   630,978.72x = 361,820,374,997.08
5. Step 5: Solve for x
   x = 361,820,374,997.08/630,978.72
6. Step 6: Final answer
   x = 573,427.22