Finding the Fourth Proportional to 90,788.56, 136,204.71 and 28,459.06

Step by Step Solution

1. Step 1: Write the proportion equation
   90,788.56 : 136,204.71 = 28,459.06 : x
2. Step 2: Convert to fraction form
   90,788.56/136,204.71 = 28,459.06/x
3. Step 3: Cross multiply
   90,788.56x = 136,204.71 × 28,459.06
4. Step 4: Simplify right side
   90,788.56x = 3,876,258,333.09
5. Step 5: Solve for x
   x = 3,876,258,333.09/90,788.56
6. Step 6: Final answer
   x = 42,695.45