Finding the Fourth Proportional to 709,085.32, 978,215.98 and 418,499.75

Step by Step Solution

1. Step 1: Write the proportion equation
   709,085.32 : 978,215.98 = 418,499.75 : x
2. Step 2: Convert to fraction form
   709,085.32/978,215.98 = 418,499.75/x
3. Step 3: Cross multiply
   709,085.32x = 978,215.98 × 418,499.75
4. Step 4: Simplify right side
   709,085.32x = 409,383,143,076.01
5. Step 5: Solve for x
   x = 409,383,143,076.01/709,085.32
6. Step 6: Final answer
   x = 577,339.75