Finding the Fourth Proportional to 1,222,138, 1,686,561.96 and 685,605.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,222,138 : 1,686,561.96 = 685,605.52 : x
2. Step 2: Convert to fraction form
   1,222,138/1,686,561.96 = 685,605.52/x
3. Step 3: Cross multiply
   1,222,138x = 1,686,561.96 × 685,605.52
4. Step 4: Simplify right side
   1,222,138x = 1,156,316,189,598.02
5. Step 5: Solve for x
   x = 1,156,316,189,598.02/1,222,138
6. Step 6: Final answer
   x = 946,142.08