Finding the Fourth Proportional to 103,785.69, 155,678.69 and 28,906.05

Step by Step Solution

1. Step 1: Write the proportion equation
   103,785.69 : 155,678.69 = 28,906.05 : x
2. Step 2: Convert to fraction form
   103,785.69/155,678.69 = 28,906.05/x
3. Step 3: Cross multiply
   103,785.69x = 155,678.69 × 28,906.05
4. Step 4: Simplify right side
   103,785.69x = 4,500,055,852.54
5. Step 5: Solve for x
   x = 4,500,055,852.54/103,785.69
6. Step 6: Final answer
   x = 43,359.12