Finding the Fourth Proportional to 262,702.98, 394,109.82 and 85,196.15

Step by Step Solution

1. Step 1: Write the proportion equation
   262,702.98 : 394,109.82 = 85,196.15 : x
2. Step 2: Convert to fraction form
   262,702.98/394,109.82 = 85,196.15/x
3. Step 3: Cross multiply
   262,702.98x = 394,109.82 × 85,196.15
4. Step 4: Simplify right side
   262,702.98x = 33,576,638,848.56
5. Step 5: Solve for x
   x = 33,576,638,848.56/262,702.98
6. Step 6: Final answer
   x = 127,812.17