Finding the Fourth Proportional to 120,709.83, 166,503.78 and 77,745

Step by Step Solution

1. Step 1: Write the proportion equation
   120,709.83 : 166,503.78 = 77,745 : x
2. Step 2: Convert to fraction form
   120,709.83/166,503.78 = 77,745/x
3. Step 3: Cross multiply
   120,709.83x = 166,503.78 × 77,745
4. Step 4: Simplify right side
   120,709.83x = 12,944,836,376.10
5. Step 5: Solve for x
   x = 12,944,836,376.10/120,709.83
6. Step 6: Final answer
   x = 107,239.29