Finding the Fourth Proportional to 90,908.73, 136,384.56 and 28,579.23

Step by Step Solution

1. Step 1: Write the proportion equation
   90,908.73 : 136,384.56 = 28,579.23 : x
2. Step 2: Convert to fraction form
   90,908.73/136,384.56 = 28,579.23/x
3. Step 3: Cross multiply
   90,908.73x = 136,384.56 × 28,579.23
4. Step 4: Simplify right side
   90,908.73x = 3,897,765,708.69
5. Step 5: Solve for x
   x = 3,897,765,708.69/90,908.73
6. Step 6: Final answer
   x = 42,875.59