Finding the Fourth Proportional to 383,123.55, 528,704.01 and 211,057.59

Step by Step Solution

1. Step 1: Write the proportion equation
   383,123.55 : 528,704.01 = 211,057.59 : x
2. Step 2: Convert to fraction form
   383,123.55/528,704.01 = 211,057.59/x
3. Step 3: Cross multiply
   383,123.55x = 528,704.01 × 211,057.59
4. Step 4: Simplify right side
   383,123.55x = 111,586,994,173.94
5. Step 5: Solve for x
   x = 111,586,994,173.94/383,123.55
6. Step 6: Final answer
   x = 291,255.90