Finding the Fourth Proportional to 528,784.72, 793,964.28 and 213,856.72

Step by Step Solution

1. Step 1: Write the proportion equation
   528,784.72 : 793,964.28 = 213,856.72 : x
2. Step 2: Convert to fraction form
   528,784.72/793,964.28 = 213,856.72/x
3. Step 3: Cross multiply
   528,784.72x = 793,964.28 × 213,856.72
4. Step 4: Simplify right side
   528,784.72x = 169,794,596,717.96
5. Step 5: Solve for x
   x = 169,794,596,717.96/528,784.72
6. Step 6: Final answer
   x = 321,103.45