Finding the Fourth Proportional to 171,681.87, 256,478.50 and 111,218.15

Step by Step Solution

1. Step 1: Write the proportion equation
   171,681.87 : 256,478.50 = 111,218.15 : x
2. Step 2: Convert to fraction form
   171,681.87/256,478.50 = 111,218.15/x
3. Step 3: Cross multiply
   171,681.87x = 256,478.50 × 111,218.15
4. Step 4: Simplify right side
   171,681.87x = 28,525,064,284.78
5. Step 5: Solve for x
   x = 28,525,064,284.78/171,681.87
6. Step 6: Final answer
   x = 166,150.71