Finding the Fourth Proportional to 870,499.28, 1,305,992.76 and 309,590.48

Step by Step Solution

1. Step 1: Write the proportion equation
   870,499.28 : 1,305,992.76 = 309,590.48 : x
2. Step 2: Convert to fraction form
   870,499.28/1,305,992.76 = 309,590.48/x
3. Step 3: Cross multiply
   870,499.28x = 1,305,992.76 × 309,590.48
4. Step 4: Simplify right side
   870,499.28x = 404,322,925,444.93
5. Step 5: Solve for x
   x = 404,322,925,444.93/870,499.28
6. Step 6: Final answer
   x = 464,472.44