Finding the Fourth Proportional to 158,097.20, 218,168.69 and 90,136.05

Step by Step Solution

1. Step 1: Write the proportion equation
   158,097.20 : 218,168.69 = 90,136.05 : x
2. Step 2: Convert to fraction form
   158,097.20/218,168.69 = 90,136.05/x
3. Step 3: Cross multiply
   158,097.20x = 218,168.69 × 90,136.05
4. Step 4: Simplify right side
   158,097.20x = 19,664,863,499.59
5. Step 5: Solve for x
   x = 19,664,863,499.59/158,097.20
6. Step 6: Final answer
   x = 124,384.65