Finding the Fourth Proportional to 386,128.59, 579,184.50 and 105,645.84

Step by Step Solution

1. Step 1: Write the proportion equation
   386,128.59 : 579,184.50 = 105,645.84 : x
2. Step 2: Convert to fraction form
   386,128.59/579,184.50 = 105,645.84/x
3. Step 3: Cross multiply
   386,128.59x = 579,184.50 × 105,645.84
4. Step 4: Simplify right side
   386,128.59x = 61,188,433,017.48
5. Step 5: Solve for x
   x = 61,188,433,017.48/386,128.59
6. Step 6: Final answer
   x = 158,466.47