Finding the Fourth Proportional to 379,436.31, 523,601.55 and 209,659.50

Step by Step Solution

1. Step 1: Write the proportion equation
   379,436.31 : 523,601.55 = 209,659.50 : x
2. Step 2: Convert to fraction form
   379,436.31/523,601.55 = 209,659.50/x
3. Step 3: Cross multiply
   379,436.31x = 523,601.55 × 209,659.50
4. Step 4: Simplify right side
   379,436.31x = 109,778,039,172.23
5. Step 5: Solve for x
   x = 109,778,039,172.23/379,436.31
6. Step 6: Final answer
   x = 289,318.75