Finding the Fourth Proportional to 90,871.42, 136,328.69 and 28,541.92

Step by Step Solution

1. Step 1: Write the proportion equation
   90,871.42 : 136,328.69 = 28,541.92 : x
2. Step 2: Convert to fraction form
   90,871.42/136,328.69 = 28,541.92/x
3. Step 3: Cross multiply
   90,871.42x = 136,328.69 × 28,541.92
4. Step 4: Simplify right side
   90,871.42x = 3,891,082,294.22
5. Step 5: Solve for x
   x = 3,891,082,294.22/90,871.42
6. Step 6: Final answer
   x = 42,819.65