Finding the Fourth Proportional to 80,091.32, 120,355.16 and 42,678.09

Step by Step Solution

1. Step 1: Write the proportion equation
   80,091.32 : 120,355.16 = 42,678.09 : x
2. Step 2: Convert to fraction form
   80,091.32/120,355.16 = 42,678.09/x
3. Step 3: Cross multiply
   80,091.32x = 120,355.16 × 42,678.09
4. Step 4: Simplify right side
   80,091.32x = 5,136,528,137.05
5. Step 5: Solve for x
   x = 5,136,528,137.05/80,091.32
6. Step 6: Final answer
   x = 64,133.40