Finding the Fourth Proportional to 91,906.10, 128,843.50 and 91,906.10

Step by Step Solution

1. Step 1: Write the proportion equation
   91,906.10 : 128,843.50 = 91,906.10 : x
2. Step 2: Convert to fraction form
   91,906.10/128,843.50 = 91,906.10/x
3. Step 3: Cross multiply
   91,906.10x = 128,843.50 × 91,906.10
4. Step 4: Simplify right side
   91,906.10x = 11,841,503,595.35
5. Step 5: Solve for x
   x = 11,841,503,595.35/91,906.10
6. Step 6: Final answer
   x = 128,843.50