Finding the Fourth Proportional to 686,019.10, 1,028,629.71 and 259,587.85

Step by Step Solution

1. Step 1: Write the proportion equation
   686,019.10 : 1,028,629.71 = 259,587.85 : x
2. Step 2: Convert to fraction form
   686,019.10/1,028,629.71 = 259,587.85/x
3. Step 3: Cross multiply
   686,019.10x = 1,028,629.71 × 259,587.85
4. Step 4: Simplify right side
   686,019.10x = 267,019,774,865.02
5. Step 5: Solve for x
   x = 267,019,774,865.02/686,019.10
6. Step 6: Final answer
   x = 389,230.82