Finding the Fourth Proportional to 1,222,641.94, 1,687,300.35 and 678,785.16

Step by Step Solution

1. Step 1: Write the proportion equation
   1,222,641.94 : 1,687,300.35 = 678,785.16 : x
2. Step 2: Convert to fraction form
   1,222,641.94/1,687,300.35 = 678,785.16/x
3. Step 3: Cross multiply
   1,222,641.94x = 1,687,300.35 × 678,785.16
4. Step 4: Simplify right side
   1,222,641.94x = 1,145,314,438,042.81
5. Step 5: Solve for x
   x = 1,145,314,438,042.81/1,222,641.94
6. Step 6: Final answer
   x = 936,753.76