Finding the Fourth Proportional to 120,635.72, 166,483.86 and 78,230.60

Step by Step Solution

1. Step 1: Write the proportion equation
   120,635.72 : 166,483.86 = 78,230.60 : x
2. Step 2: Convert to fraction form
   120,635.72/166,483.86 = 78,230.60/x
3. Step 3: Cross multiply
   120,635.72x = 166,483.86 × 78,230.60
4. Step 4: Simplify right side
   120,635.72x = 13,024,132,258.12
5. Step 5: Solve for x
   x = 13,024,132,258.12/120,635.72
6. Step 6: Final answer
   x = 107,962.49