Finding the Fourth Proportional to 171,061.20, 256,300.20 and 145,983.60

Step by Step Solution

1. Step 1: Write the proportion equation
   171,061.20 : 256,300.20 = 145,983.60 : x
2. Step 2: Convert to fraction form
   171,061.20/256,300.20 = 145,983.60/x
3. Step 3: Cross multiply
   171,061.20x = 256,300.20 × 145,983.60
4. Step 4: Simplify right side
   171,061.20x = 37,415,625,876.72
5. Step 5: Solve for x
   x = 37,415,625,876.72/171,061.20
6. Step 6: Final answer
   x = 218,726.55