Finding the Fourth Proportional to 409,100.69, 613,747.62 and 128,617.94

Step by Step Solution

1. Step 1: Write the proportion equation
   409,100.69 : 613,747.62 = 128,617.94 : x
2. Step 2: Convert to fraction form
   409,100.69/613,747.62 = 128,617.94/x
3. Step 3: Cross multiply
   409,100.69x = 613,747.62 × 128,617.94
4. Step 4: Simplify right side
   409,100.69x = 78,938,951,495.56
5. Step 5: Solve for x
   x = 78,938,951,495.56/409,100.69
6. Step 6: Final answer
   x = 192,957.27