Finding the Fourth Proportional to 263,401.10, 395,061.54 and 85,907.82

Step by Step Solution

1. Step 1: Write the proportion equation
   263,401.10 : 395,061.54 = 85,907.82 : x
2. Step 2: Convert to fraction form
   263,401.10/395,061.54 = 85,907.82/x
3. Step 3: Cross multiply
   263,401.10x = 395,061.54 × 85,907.82
4. Step 4: Simplify right side
   263,401.10x = 33,938,875,667.24
5. Step 5: Solve for x
   x = 33,938,875,667.24/263,401.10
6. Step 6: Final answer
   x = 128,848.65