Finding the Fourth Proportional to 899,080.72, 1,240,731.39 and 496,672.72

Step by Step Solution

1. Step 1: Write the proportion equation
   899,080.72 : 1,240,731.39 = 496,672.72 : x
2. Step 2: Convert to fraction form
   899,080.72/1,240,731.39 = 496,672.72/x
3. Step 3: Cross multiply
   899,080.72x = 1,240,731.39 × 496,672.72
4. Step 4: Simplify right side
   899,080.72x = 616,237,434,260.68
5. Step 5: Solve for x
   x = 616,237,434,260.68/899,080.72
6. Step 6: Final answer
   x = 685,408.35