Finding the Fourth Proportional to 90,820.76, 136,231.02 and 28,496.12

Step by Step Solution

1. Step 1: Write the proportion equation
   90,820.76 : 136,231.02 = 28,496.12 : x
2. Step 2: Convert to fraction form
   90,820.76/136,231.02 = 28,496.12/x
3. Step 3: Cross multiply
   90,820.76x = 136,231.02 × 28,496.12
4. Step 4: Simplify right side
   90,820.76x = 3,882,055,493.64
5. Step 5: Solve for x
   x = 3,882,055,493.64/90,820.76
6. Step 6: Final answer
   x = 42,744.14