Finding the Fourth Proportional to 318,621.83, 478,003.05 and 105,456.15

Step by Step Solution

1. Step 1: Write the proportion equation
   318,621.83 : 478,003.05 = 105,456.15 : x
2. Step 2: Convert to fraction form
   318,621.83/478,003.05 = 105,456.15/x
3. Step 3: Cross multiply
   318,621.83x = 478,003.05 × 105,456.15
4. Step 4: Simplify right side
   318,621.83x = 50,408,361,341.26
5. Step 5: Solve for x
   x = 50,408,361,341.26/318,621.83
6. Step 6: Final answer
   x = 158,207.50