Finding the Fourth Proportional to 171,017.88, 256,543.83 and 139,724.34

Step by Step Solution

1. Step 1: Write the proportion equation
   171,017.88 : 256,543.83 = 139,724.34 : x
2. Step 2: Convert to fraction form
   171,017.88/256,543.83 = 139,724.34/x
3. Step 3: Cross multiply
   171,017.88x = 256,543.83 × 139,724.34
4. Step 4: Simplify right side
   171,017.88x = 35,845,417,327.82
5. Step 5: Solve for x
   x = 35,845,417,327.82/171,017.88
6. Step 6: Final answer
   x = 209,600.41