Finding the Fourth Proportional to 1,188,150.24, 1,639,067.76 and 678,718.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,188,150.24 : 1,639,067.76 = 678,718.56 : x
2. Step 2: Convert to fraction form
   1,188,150.24/1,639,067.76 = 678,718.56/x
3. Step 3: Cross multiply
   1,188,150.24x = 1,639,067.76 × 678,718.56
4. Step 4: Simplify right side
   1,188,150.24x = 1,112,465,709,809.63
5. Step 5: Solve for x
   x = 1,112,465,709,809.63/1,188,150.24
6. Step 6: Final answer
   x = 936,300.54