Finding the Fourth Proportional to 90,245.64, 135,365.59 and 42,894.80

Step by Step Solution

1. Step 1: Write the proportion equation
   90,245.64 : 135,365.59 = 42,894.80 : x
2. Step 2: Convert to fraction form
   90,245.64/135,365.59 = 42,894.80/x
3. Step 3: Cross multiply
   90,245.64x = 135,365.59 × 42,894.80
4. Step 4: Simplify right side
   90,245.64x = 5,806,479,018.63
5. Step 5: Solve for x
   x = 5,806,479,018.63/90,245.64
6. Step 6: Final answer
   x = 64,340.83