Finding the Fourth Proportional to 448,429.33, 672,328.62 and 208,288.27

Step by Step Solution

1. Step 1: Write the proportion equation
   448,429.33 : 672,328.62 = 208,288.27 : x
2. Step 2: Convert to fraction form
   448,429.33/672,328.62 = 208,288.27/x
3. Step 3: Cross multiply
   448,429.33x = 672,328.62 × 208,288.27
4. Step 4: Simplify right side
   448,429.33x = 140,038,165,131.29
5. Step 5: Solve for x
   x = 140,038,165,131.29/448,429.33
6. Step 6: Final answer
   x = 312,285.92