Finding the Fourth Proportional to 108,408.10, 162,806.55 and 78,859.30

Step by Step Solution

1. Step 1: Write the proportion equation
   108,408.10 : 162,806.55 = 78,859.30 : x
2. Step 2: Convert to fraction form
   108,408.10/162,806.55 = 78,859.30/x
3. Step 3: Cross multiply
   108,408.10x = 162,806.55 × 78,859.30
4. Step 4: Simplify right side
   108,408.10x = 12,838,810,568.42
5. Step 5: Solve for x
   x = 12,838,810,568.42/108,408.10
6. Step 6: Final answer
   x = 118,430.36