Finding the Fourth Proportional to 379,656.25, 523,936.56 and 209,901.31

Step by Step Solution

1. Step 1: Write the proportion equation
   379,656.25 : 523,936.56 = 209,901.31 : x
2. Step 2: Convert to fraction form
   379,656.25/523,936.56 = 209,901.31/x
3. Step 3: Cross multiply
   379,656.25x = 523,936.56 × 209,901.31
4. Step 4: Simplify right side
   379,656.25x = 109,974,970,300.89
5. Step 5: Solve for x
   x = 109,974,970,300.89/379,656.25
6. Step 6: Final answer
   x = 289,669.85