Finding the Fourth Proportional to 105,651.42, 145,538.55 and 90,494.70

Step by Step Solution

1. Step 1: Write the proportion equation
   105,651.42 : 145,538.55 = 90,494.70 : x
2. Step 2: Convert to fraction form
   105,651.42/145,538.55 = 90,494.70/x
3. Step 3: Cross multiply
   105,651.42x = 145,538.55 × 90,494.70
4. Step 4: Simplify right side
   105,651.42x = 13,170,467,420.69
5. Step 5: Solve for x
   x = 13,170,467,420.69/105,651.42
6. Step 6: Final answer
   x = 124,659.63