Finding the Fourth Proportional to 382,978.04, 528,499.36 and 213,212.18

Step by Step Solution

1. Step 1: Write the proportion equation
   382,978.04 : 528,499.36 = 213,212.18 : x
2. Step 2: Convert to fraction form
   382,978.04/528,499.36 = 213,212.18/x
3. Step 3: Cross multiply
   382,978.04x = 528,499.36 × 213,212.18
4. Step 4: Simplify right side
   382,978.04x = 112,682,500,674.21
5. Step 5: Solve for x
   x = 112,682,500,674.21/382,978.04
6. Step 6: Final answer
   x = 294,227.05