Finding the Fourth Proportional to 258,770.71, 388,152.82 and 90,290.71

Step by Step Solution

1. Step 1: Write the proportion equation
   258,770.71 : 388,152.82 = 90,290.71 : x
2. Step 2: Convert to fraction form
   258,770.71/388,152.82 = 90,290.71/x
3. Step 3: Cross multiply
   258,770.71x = 388,152.82 × 90,290.71
4. Step 4: Simplify right side
   258,770.71x = 35,046,593,706.30
5. Step 5: Solve for x
   x = 35,046,593,706.30/258,770.71
6. Step 6: Final answer
   x = 135,434.93