Finding the Fourth Proportional to 878,383.12, 1,316,978.52 and 279,164.56

Step by Step Solution

1. Step 1: Write the proportion equation
   878,383.12 : 1,316,978.52 = 279,164.56 : x
2. Step 2: Convert to fraction form
   878,383.12/1,316,978.52 = 279,164.56/x
3. Step 3: Cross multiply
   878,383.12x = 1,316,978.52 × 279,164.56
4. Step 4: Simplify right side
   878,383.12x = 367,653,729,065.25
5. Step 5: Solve for x
   x = 367,653,729,065.25/878,383.12
6. Step 6: Final answer
   x = 418,557.37