Finding the Fourth Proportional to 165,815, 228,826.32 and 90,365.12

Step by Step Solution

1. Step 1: Write the proportion equation
   165,815 : 228,826.32 = 90,365.12 : x
2. Step 2: Convert to fraction form
   165,815/228,826.32 = 90,365.12/x
3. Step 3: Cross multiply
   165,815x = 228,826.32 × 90,365.12
4. Step 4: Simplify right side
   165,815x = 20,677,917,865.96
5. Step 5: Solve for x
   x = 20,677,917,865.96/165,815
6. Step 6: Final answer
   x = 124,704.75