Finding the Fourth Proportional to 90,559.68, 135,846.72 and 28,230.72

Step by Step Solution

1. Step 1: Write the proportion equation
   90,559.68 : 135,846.72 = 28,230.72 : x
2. Step 2: Convert to fraction form
   90,559.68/135,846.72 = 28,230.72/x
3. Step 3: Cross multiply
   90,559.68x = 135,846.72 × 28,230.72
4. Step 4: Simplify right side
   90,559.68x = 3,835,050,715.24
5. Step 5: Solve for x
   x = 3,835,050,715.24/90,559.68
6. Step 6: Final answer
   x = 42,348.32