Finding the Fourth Proportional to 151,989.52, 209,919.72 and 123,840.40

Step by Step Solution

1. Step 1: Write the proportion equation
   151,989.52 : 209,919.72 = 123,840.40 : x
2. Step 2: Convert to fraction form
   151,989.52/209,919.72 = 123,840.40/x
3. Step 3: Cross multiply
   151,989.52x = 209,919.72 × 123,840.40
4. Step 4: Simplify right side
   151,989.52x = 25,996,542,092.69
5. Step 5: Solve for x
   x = 25,996,542,092.69/151,989.52
6. Step 6: Final answer
   x = 171,041.68