Finding the Fourth Proportional to 393,870.34, 543,538.29 and 215,022.34

Step by Step Solution

1. Step 1: Write the proportion equation
   393,870.34 : 543,538.29 = 215,022.34 : x
2. Step 2: Convert to fraction form
   393,870.34/543,538.29 = 215,022.34/x
3. Step 3: Cross multiply
   393,870.34x = 543,538.29 × 215,022.34
4. Step 4: Simplify right side
   393,870.34x = 116,872,874,995.40
5. Step 5: Solve for x
   x = 116,872,874,995.40/393,870.34
6. Step 6: Final answer
   x = 296,729.31