Finding the Fourth Proportional to 379,028.69, 523,105.46 and 215,724.90

Step by Step Solution

1. Step 1: Write the proportion equation
   379,028.69 : 523,105.46 = 215,724.90 : x
2. Step 2: Convert to fraction form
   379,028.69/523,105.46 = 215,724.90/x
3. Step 3: Cross multiply
   379,028.69x = 523,105.46 × 215,724.90
4. Step 4: Simplify right side
   379,028.69x = 112,846,871,969.33
5. Step 5: Solve for x
   x = 112,846,871,969.33/379,028.69
6. Step 6: Final answer
   x = 297,726.47