Finding the Fourth Proportional to 409,108.86, 613,759.86 and 128,626.10

Step by Step Solution

1. Step 1: Write the proportion equation
   409,108.86 : 613,759.86 = 128,626.10 : x
2. Step 2: Convert to fraction form
   409,108.86/613,759.86 = 128,626.10/x
3. Step 3: Cross multiply
   409,108.86x = 613,759.86 × 128,626.10
4. Step 4: Simplify right side
   409,108.86x = 78,945,537,128.35
5. Step 5: Solve for x
   x = 78,945,537,128.35/409,108.86
6. Step 6: Final answer
   x = 192,969.51