Finding the Fourth Proportional to 528,429.12, 793,005.12 and 212,910.72

Step by Step Solution

1. Step 1: Write the proportion equation
   528,429.12 : 793,005.12 = 212,910.72 : x
2. Step 2: Convert to fraction form
   528,429.12/793,005.12 = 212,910.72/x
3. Step 3: Cross multiply
   528,429.12x = 793,005.12 × 212,910.72
4. Step 4: Simplify right side
   528,429.12x = 168,839,291,062.89
5. Step 5: Solve for x
   x = 168,839,291,062.89/528,429.12
6. Step 6: Final answer
   x = 319,511.71