Finding the Fourth Proportional to 257,408.34, 355,223.61 and 156,806.34

Step by Step Solution

1. Step 1: Write the proportion equation
   257,408.34 : 355,223.61 = 156,806.34 : x
2. Step 2: Convert to fraction form
   257,408.34/355,223.61 = 156,806.34/x
3. Step 3: Cross multiply
   257,408.34x = 355,223.61 × 156,806.34
4. Step 4: Simplify right side
   257,408.34x = 55,701,314,165.69
5. Step 5: Solve for x
   x = 55,701,314,165.69/257,408.34
6. Step 6: Final answer
   x = 216,392.81