Finding the Fourth Proportional to 445,978.71, 669,155.72 and 277,639.92

Step by Step Solution

1. Step 1: Write the proportion equation
   445,978.71 : 669,155.72 = 277,639.92 : x
2. Step 2: Convert to fraction form
   445,978.71/669,155.72 = 277,639.92/x
3. Step 3: Cross multiply
   445,978.71x = 669,155.72 × 277,639.92
4. Step 4: Simplify right side
   445,978.71x = 185,784,339,180.14
5. Step 5: Solve for x
   x = 185,784,339,180.14/445,978.71
6. Step 6: Final answer
   x = 416,576.70