Finding the Fourth Proportional to 171,222.76, 256,485.98 and 139,745

Step by Step Solution

1. Step 1: Write the proportion equation
   171,222.76 : 256,485.98 = 139,745 : x
2. Step 2: Convert to fraction form
   171,222.76/256,485.98 = 139,745/x
3. Step 3: Cross multiply
   171,222.76x = 256,485.98 × 139,745
4. Step 4: Simplify right side
   171,222.76x = 35,842,633,275.10
5. Step 5: Solve for x
   x = 35,842,633,275.10/171,222.76
6. Step 6: Final answer
   x = 209,333.35