Finding the Fourth Proportional to 456,297.88, 684,077.72 and 278,745

Step by Step Solution

1. Step 1: Write the proportion equation
   456,297.88 : 684,077.72 = 278,745 : x
2. Step 2: Convert to fraction form
   456,297.88/684,077.72 = 278,745/x
3. Step 3: Cross multiply
   456,297.88x = 684,077.72 × 278,745
4. Step 4: Simplify right side
   456,297.88x = 190,683,244,061.40
5. Step 5: Solve for x
   x = 190,683,244,061.40/456,297.88
6. Step 6: Final answer
   x = 417,892.02