Finding the Fourth Proportional to 120,500.63, 166,290.86 and 72,765.71

Step by Step Solution

1. Step 1: Write the proportion equation
   120,500.63 : 166,290.86 = 72,765.71 : x
2. Step 2: Convert to fraction form
   120,500.63/166,290.86 = 72,765.71/x
3. Step 3: Cross multiply
   120,500.63x = 166,290.86 × 72,765.71
4. Step 4: Simplify right side
   120,500.63x = 12,100,272,494.41
5. Step 5: Solve for x
   x = 12,100,272,494.41/120,500.63
6. Step 6: Final answer
   x = 100,416.67