Finding the Fourth Proportional to 80,426.24, 120,516.31 and 42,991.62

Step by Step Solution

1. Step 1: Write the proportion equation
   80,426.24 : 120,516.31 = 42,991.62 : x
2. Step 2: Convert to fraction form
   80,426.24/120,516.31 = 42,991.62/x
3. Step 3: Cross multiply
   80,426.24x = 120,516.31 × 42,991.62
4. Step 4: Simplify right side
   80,426.24x = 5,181,191,403.32
5. Step 5: Solve for x
   x = 5,181,191,403.32/80,426.24
6. Step 6: Final answer
   x = 64,421.65