Finding the Fourth Proportional to 258,792.98, 388,066.41 and 90,292.91

Step by Step Solution

1. Step 1: Write the proportion equation
   258,792.98 : 388,066.41 = 90,292.91 : x
2. Step 2: Convert to fraction form
   258,792.98/388,066.41 = 90,292.91/x
3. Step 3: Cross multiply
   258,792.98x = 388,066.41 × 90,292.91
4. Step 4: Simplify right side
   258,792.98x = 35,039,643,491.82
5. Step 5: Solve for x
   x = 35,039,643,491.82/258,792.98
6. Step 6: Final answer
   x = 135,396.42