Finding the Fourth Proportional to 413,870.40, 621,041.40 and 161,118.09

Step by Step Solution

1. Step 1: Write the proportion equation
   413,870.40 : 621,041.40 = 161,118.09 : x
2. Step 2: Convert to fraction form
   413,870.40/621,041.40 = 161,118.09/x
3. Step 3: Cross multiply
   413,870.40x = 621,041.40 × 161,118.09
4. Step 4: Simplify right side
   413,870.40x = 100,061,004,178.93
5. Step 5: Solve for x
   x = 100,061,004,178.93/413,870.40
6. Step 6: Final answer
   x = 241,768.93