Finding the Fourth Proportional to 1,222,200.09, 1,686,610.76 and 678,303.99

Step by Step Solution

1. Step 1: Write the proportion equation
   1,222,200.09 : 1,686,610.76 = 678,303.99 : x
2. Step 2: Convert to fraction form
   1,222,200.09/1,686,610.76 = 678,303.99/x
3. Step 3: Cross multiply
   1,222,200.09x = 1,686,610.76 × 678,303.99
4. Step 4: Simplify right side
   1,222,200.09x = 1,144,034,804,693.41
5. Step 5: Solve for x
   x = 1,144,034,804,693.41/1,222,200.09
6. Step 6: Final answer
   x = 936,045.43