Finding the Fourth Proportional to 280,426.05, 420,642.72 and 80,749.71

Step by Step Solution

1. Step 1: Write the proportion equation
   280,426.05 : 420,642.72 = 80,749.71 : x
2. Step 2: Convert to fraction form
   280,426.05/420,642.72 = 80,749.71/x
3. Step 3: Cross multiply
   280,426.05x = 420,642.72 × 80,749.71
4. Step 4: Simplify right side
   280,426.05x = 33,966,777,653.61
5. Step 5: Solve for x
   x = 33,966,777,653.61/280,426.05
6. Step 6: Final answer
   x = 121,125.61