Finding the Fourth Proportional to 639,824.78, 882,979.98 and 378,404.18

Step by Step Solution

1. Step 1: Write the proportion equation
   639,824.78 : 882,979.98 = 378,404.18 : x
2. Step 2: Convert to fraction form
   639,824.78/882,979.98 = 378,404.18/x
3. Step 3: Cross multiply
   639,824.78x = 882,979.98 × 378,404.18
4. Step 4: Simplify right side
   639,824.78x = 334,123,310,873.42
5. Step 5: Solve for x
   x = 334,123,310,873.42/639,824.78
6. Step 6: Final answer
   x = 522,210.65