Finding the Fourth Proportional to 469,146.78, 647,406.81 and 278,046.72

Step by Step Solution

1. Step 1: Write the proportion equation
   469,146.78 : 647,406.81 = 278,046.72 : x
2. Step 2: Convert to fraction form
   469,146.78/647,406.81 = 278,046.72/x
3. Step 3: Cross multiply
   469,146.78x = 647,406.81 × 278,046.72
4. Step 4: Simplify right side
   469,146.78x = 180,009,340,026.16
5. Step 5: Solve for x
   x = 180,009,340,026.16/469,146.78
6. Step 6: Final answer
   x = 383,695.14