Finding the Fourth Proportional to 383,085.91, 528,662.12 and 211,004.50

Step by Step Solution

1. Step 1: Write the proportion equation
   383,085.91 : 528,662.12 = 211,004.50 : x
2. Step 2: Convert to fraction form
   383,085.91/528,662.12 = 211,004.50/x
3. Step 3: Cross multiply
   383,085.91x = 528,662.12 × 211,004.50
4. Step 4: Simplify right side
   383,085.91x = 111,550,083,427.24
5. Step 5: Solve for x
   x = 111,550,083,427.24/383,085.91
6. Step 6: Final answer
   x = 291,188.17