Finding the Fourth Proportional to 888,048.72, 1,225,488.96 and 485,640.72

Step by Step Solution

1. Step 1: Write the proportion equation
   888,048.72 : 1,225,488.96 = 485,640.72 : x
2. Step 2: Convert to fraction form
   888,048.72/1,225,488.96 = 485,640.72/x
3. Step 3: Cross multiply
   888,048.72x = 1,225,488.96 × 485,640.72
4. Step 4: Simplify right side
   888,048.72x = 595,147,340,886.45
5. Step 5: Solve for x
   x = 595,147,340,886.45/888,048.72
6. Step 6: Final answer
   x = 670,174.20