Finding the Fourth Proportional to 2,578,688.52, 3,868,028.55 and 685,429.98

Step by Step Solution

1. Step 1: Write the proportion equation
   2,578,688.52 : 3,868,028.55 = 685,429.98 : x
2. Step 2: Convert to fraction form
   2,578,688.52/3,868,028.55 = 685,429.98/x
3. Step 3: Cross multiply
   2,578,688.52x = 3,868,028.55 × 685,429.98
4. Step 4: Simplify right side
   2,578,688.52x = 2,651,262,731,665.93
5. Step 5: Solve for x
   x = 2,651,262,731,665.93/2,578,688.52
6. Step 6: Final answer
   x = 1,028,143.85