Finding the Fourth Proportional to 1,222,764.74, 1,687,468.04 and 678,900.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,222,764.74 : 1,687,468.04 = 678,900.55 : x
2. Step 2: Convert to fraction form
   1,222,764.74/1,687,468.04 = 678,900.55/x
3. Step 3: Cross multiply
   1,222,764.74x = 1,687,468.04 × 678,900.55
4. Step 4: Simplify right side
   1,222,764.74x = 1,145,622,980,463.42
5. Step 5: Solve for x
   x = 1,145,622,980,463.42/1,222,764.74
6. Step 6: Final answer
   x = 936,912.02