Finding the Fourth Proportional to 158,388.63, 218,591.97 and 90,415.83

Step by Step Solution

1. Step 1: Write the proportion equation
   158,388.63 : 218,591.97 = 90,415.83 : x
2. Step 2: Convert to fraction form
   158,388.63/218,591.97 = 90,415.83/x
3. Step 3: Cross multiply
   158,388.63x = 218,591.97 × 90,415.83
4. Step 4: Simplify right side
   158,388.63x = 19,764,174,398.89
5. Step 5: Solve for x
   x = 19,764,174,398.89/158,388.63
6. Step 6: Final answer
   x = 124,782.79