Finding the Fourth Proportional to 209,159.09, 288,609.49 and 123,066.89

Step by Step Solution

1. Step 1: Write the proportion equation
   209,159.09 : 288,609.49 = 123,066.89 : x
2. Step 2: Convert to fraction form
   209,159.09/288,609.49 = 123,066.89/x
3. Step 3: Cross multiply
   209,159.09x = 288,609.49 × 123,066.89
4. Step 4: Simplify right side
   209,159.09x = 35,518,272,151.86
5. Step 5: Solve for x
   x = 35,518,272,151.86/209,159.09
6. Step 6: Final answer
   x = 169,814.62