Finding the Fourth Proportional to 352,300.72, 486,301.07 and 209,060.72

Step by Step Solution

1. Step 1: Write the proportion equation
   352,300.72 : 486,301.07 = 209,060.72 : x
2. Step 2: Convert to fraction form
   352,300.72/486,301.07 = 209,060.72/x
3. Step 3: Cross multiply
   352,300.72x = 486,301.07 × 209,060.72
4. Step 4: Simplify right side
   352,300.72x = 101,666,450,785.67
5. Step 5: Solve for x
   x = 101,666,450,785.67/352,300.72
6. Step 6: Final answer
   x = 288,578.61