Finding the Fourth Proportional to 456,061.76, 683,470.56 and 278,630.72

Step by Step Solution

1. Step 1: Write the proportion equation
   456,061.76 : 683,470.56 = 278,630.72 : x
2. Step 2: Convert to fraction form
   456,061.76/683,470.56 = 278,630.72/x
3. Step 3: Cross multiply
   456,061.76x = 683,470.56 × 278,630.72
4. Step 4: Simplify right side
   456,061.76x = 190,435,894,231.60
5. Step 5: Solve for x
   x = 190,435,894,231.60/456,061.76
6. Step 6: Final answer
   x = 417,566.02