Finding the Fourth Proportional to 699,128.48, 1,048,028.28 and 445,697.72

Step by Step Solution

1. Step 1: Write the proportion equation
   699,128.48 : 1,048,028.28 = 445,697.72 : x
2. Step 2: Convert to fraction form
   699,128.48/1,048,028.28 = 445,697.72/x
3. Step 3: Cross multiply
   699,128.48x = 1,048,028.28 × 445,697.72
4. Step 4: Simplify right side
   699,128.48x = 467,103,814,891.52
5. Step 5: Solve for x
   x = 467,103,814,891.52/699,128.48
6. Step 6: Final answer
   x = 668,123.00