Finding the Fourth Proportional to 1,315,776.64, 1,815,205.60 and 772,078.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,315,776.64 : 1,815,205.60 = 772,078.72 : x
2. Step 2: Convert to fraction form
   1,315,776.64/1,815,205.60 = 772,078.72/x
3. Step 3: Cross multiply
   1,315,776.64x = 1,815,205.60 × 772,078.72
4. Step 4: Simplify right side
   1,315,776.64x = 1,401,481,616,184.83
5. Step 5: Solve for x
   x = 1,401,481,616,184.83/1,315,776.64
6. Step 6: Final answer
   x = 1,065,136.42