Finding the Fourth Proportional to 258,830.37, 388,338.98 and 90,375.53

Step by Step Solution

1. Step 1: Write the proportion equation
   258,830.37 : 388,338.98 = 90,375.53 : x
2. Step 2: Convert to fraction form
   258,830.37/388,338.98 = 90,375.53/x
3. Step 3: Cross multiply
   258,830.37x = 388,338.98 × 90,375.53
4. Step 4: Simplify right side
   258,830.37x = 35,096,338,743.59
5. Step 5: Solve for x
   x = 35,096,338,743.59/258,830.37
6. Step 6: Final answer
   x = 135,595.91