Finding the Fourth Proportional to 257,411.34, 355,227.78 and 156,809.34

Step by Step Solution

1. Step 1: Write the proportion equation
   257,411.34 : 355,227.78 = 156,809.34 : x
2. Step 2: Convert to fraction form
   257,411.34/355,227.78 = 156,809.34/x
3. Step 3: Cross multiply
   257,411.34x = 355,227.78 × 156,809.34
4. Step 4: Simplify right side
   257,411.34x = 55,703,033,731.47
5. Step 5: Solve for x
   x = 55,703,033,731.47/257,411.34
6. Step 6: Final answer
   x = 216,396.97