Finding the Fourth Proportional to 745,488.32, 1,028,746.72 and 405,949.12

Step by Step Solution

1. Step 1: Write the proportion equation
   745,488.32 : 1,028,746.72 = 405,949.12 : x
2. Step 2: Convert to fraction form
   745,488.32/1,028,746.72 = 405,949.12/x
3. Step 3: Cross multiply
   745,488.32x = 1,028,746.72 × 405,949.12
4. Step 4: Simplify right side
   745,488.32x = 417,618,825,686.89
5. Step 5: Solve for x
   x = 417,618,825,686.89/745,488.32
6. Step 6: Final answer
   x = 560,194.99