Finding the Fourth Proportional to 571,105.99, 788,109.06 and 312,979.78

Step by Step Solution

1. Step 1: Write the proportion equation
   571,105.99 : 788,109.06 = 312,979.78 : x
2. Step 2: Convert to fraction form
   571,105.99/788,109.06 = 312,979.78/x
3. Step 3: Cross multiply
   571,105.99x = 788,109.06 × 312,979.78
4. Step 4: Simplify right side
   571,105.99x = 246,662,200,214.81
5. Step 5: Solve for x
   x = 246,662,200,214.81/571,105.99
6. Step 6: Final answer
   x = 431,902.67