Finding the Fourth Proportional to 297,105.57, 445,698.05 and 86,740.47

Step by Step Solution

1. Step 1: Write the proportion equation
   297,105.57 : 445,698.05 = 86,740.47 : x
2. Step 2: Convert to fraction form
   297,105.57/445,698.05 = 86,740.47/x
3. Step 3: Cross multiply
   297,105.57x = 445,698.05 × 86,740.47
4. Step 4: Simplify right side
   297,105.57x = 38,660,057,901.38
5. Step 5: Solve for x
   x = 38,660,057,901.38/297,105.57
6. Step 6: Final answer
   x = 130,122.29