Finding the Fourth Proportional to 765,123.30, 1,147,636.35 and 259,683.30

Step by Step Solution

1. Step 1: Write the proportion equation
   765,123.30 : 1,147,636.35 = 259,683.30 : x
2. Step 2: Convert to fraction form
   765,123.30/1,147,636.35 = 259,683.30/x
3. Step 3: Cross multiply
   765,123.30x = 1,147,636.35 × 259,683.30
4. Step 4: Simplify right side
   765,123.30x = 298,021,994,567.96
5. Step 5: Solve for x
   x = 298,021,994,567.96/765,123.30
6. Step 6: Final answer
   x = 389,508.46