Finding the Fourth Proportional to 409,007.84, 613,573.68 and 128,498.72

Step by Step Solution

1. Step 1: Write the proportion equation
   409,007.84 : 613,573.68 = 128,498.72 : x
2. Step 2: Convert to fraction form
   409,007.84/613,573.68 = 128,498.72/x
3. Step 3: Cross multiply
   409,007.84x = 613,573.68 × 128,498.72
4. Step 4: Simplify right side
   409,007.84x = 78,843,432,505.69
5. Step 5: Solve for x
   x = 78,843,432,505.69/409,007.84
6. Step 6: Final answer
   x = 192,767.53