Finding the Fourth Proportional to 90,912.17, 136,389.72 and 28,582.67

Step by Step Solution

1. Step 1: Write the proportion equation
   90,912.17 : 136,389.72 = 28,582.67 : x
2. Step 2: Convert to fraction form
   90,912.17/136,389.72 = 28,582.67/x
3. Step 3: Cross multiply
   90,912.17x = 136,389.72 × 28,582.67
4. Step 4: Simplify right side
   90,912.17x = 3,898,382,358.15
5. Step 5: Solve for x
   x = 3,898,382,358.15/90,912.17
6. Step 6: Final answer
   x = 42,880.75