Finding the Fourth Proportional to 680,742.72, 1,020,982.32 and 259,918.56

Step by Step Solution

1. Step 1: Write the proportion equation
   680,742.72 : 1,020,982.32 = 259,918.56 : x
2. Step 2: Convert to fraction form
   680,742.72/1,020,982.32 = 259,918.56/x
3. Step 3: Cross multiply
   680,742.72x = 1,020,982.32 × 259,918.56
4. Step 4: Simplify right side
   680,742.72x = 265,372,254,399.86
5. Step 5: Solve for x
   x = 265,372,254,399.86/680,742.72
6. Step 6: Final answer
   x = 389,827.53