Finding the Fourth Proportional to 866,903.98, 1,300,617.78 and 259,712.05

Step by Step Solution

1. Step 1: Write the proportion equation
   866,903.98 : 1,300,617.78 = 259,712.05 : x
2. Step 2: Convert to fraction form
   866,903.98/1,300,617.78 = 259,712.05/x
3. Step 3: Cross multiply
   866,903.98x = 1,300,617.78 × 259,712.05
4. Step 4: Simplify right side
   866,903.98x = 337,786,109,910.25
5. Step 5: Solve for x
   x = 337,786,109,910.25/866,903.98
6. Step 6: Final answer
   x = 389,646.51