Finding the Fourth Proportional to 209,457.55, 289,072.83 and 123,443.29

Step by Step Solution

1. Step 1: Write the proportion equation
   209,457.55 : 289,072.83 = 123,443.29 : x
2. Step 2: Convert to fraction form
   209,457.55/289,072.83 = 123,443.29/x
3. Step 3: Cross multiply
   209,457.55x = 289,072.83 × 123,443.29
4. Step 4: Simplify right side
   209,457.55x = 35,684,101,184.81
5. Step 5: Solve for x
   x = 35,684,101,184.81/209,457.55
6. Step 6: Final answer
   x = 170,364.36