Finding the Fourth Proportional to 819,728.76, 1,228,748.56 and 314,172.12

Step by Step Solution

1. Step 1: Write the proportion equation
   819,728.76 : 1,228,748.56 = 314,172.12 : x
2. Step 2: Convert to fraction form
   819,728.76/1,228,748.56 = 314,172.12/x
3. Step 3: Cross multiply
   819,728.76x = 1,228,748.56 × 314,172.12
4. Step 4: Simplify right side
   819,728.76x = 386,038,540,042.15
5. Step 5: Solve for x
   x = 386,038,540,042.15/819,728.76
6. Step 6: Final answer
   x = 470,934.48