Finding the Fourth Proportional to 1,222,864, 1,687,552.32 and 686,320

Step by Step Solution

1. Step 1: Write the proportion equation
   1,222,864 : 1,687,552.32 = 686,320 : x
2. Step 2: Convert to fraction form
   1,222,864/1,687,552.32 = 686,320/x
3. Step 3: Cross multiply
   1,222,864x = 1,687,552.32 × 686,320
4. Step 4: Simplify right side
   1,222,864x = 1,158,200,908,262.40
5. Step 5: Solve for x
   x = 1,158,200,908,262.40/1,222,864
6. Step 6: Final answer
   x = 947,121.60