Finding the Fourth Proportional to 379,022.55, 523,051.47 and 209,256.69

Step by Step Solution

1. Step 1: Write the proportion equation
   379,022.55 : 523,051.47 = 209,256.69 : x
2. Step 2: Convert to fraction form
   379,022.55/523,051.47 = 209,256.69/x
3. Step 3: Cross multiply
   379,022.55x = 523,051.47 × 209,256.69
4. Step 4: Simplify right side
   379,022.55x = 109,452,019,311.83
5. Step 5: Solve for x
   x = 109,452,019,311.83/379,022.55
6. Step 6: Final answer
   x = 288,774.43