Finding the Fourth Proportional to 120,478.77, 166,265 and 72,722.79

Step by Step Solution

1. Step 1: Write the proportion equation
   120,478.77 : 166,265 = 72,722.79 : x
2. Step 2: Convert to fraction form
   120,478.77/166,265 = 72,722.79/x
3. Step 3: Cross multiply
   120,478.77x = 166,265 × 72,722.79
4. Step 4: Simplify right side
   120,478.77x = 12,091,254,679.35
5. Step 5: Solve for x
   x = 12,091,254,679.35/120,478.77
6. Step 6: Final answer
   x = 100,360.04