Finding the Fourth Proportional to 209,106.96, 288,573.48 and 123,072

Step by Step Solution

1. Step 1: Write the proportion equation
   209,106.96 : 288,573.48 = 123,072 : x
2. Step 2: Convert to fraction form
   209,106.96/288,573.48 = 123,072/x
3. Step 3: Cross multiply
   209,106.96x = 288,573.48 × 123,072
4. Step 4: Simplify right side
   209,106.96x = 35,515,315,330.56
5. Step 5: Solve for x
   x = 35,515,315,330.56/209,106.96
6. Step 6: Final answer
   x = 169,842.82