Finding the Fourth Proportional to 1,288,103.78, 1,777,513.83 and 715,107.07

Step by Step Solution

1. Step 1: Write the proportion equation
   1,288,103.78 : 1,777,513.83 = 715,107.07 : x
2. Step 2: Convert to fraction form
   1,288,103.78/1,777,513.83 = 715,107.07/x
3. Step 3: Cross multiply
   1,288,103.78x = 1,777,513.83 × 715,107.07
4. Step 4: Simplify right side
   1,288,103.78x = 1,271,112,697,968.21
5. Step 5: Solve for x
   x = 1,271,112,697,968.21/1,288,103.78
6. Step 6: Final answer
   x = 986,809.23