Finding the Fourth Proportional to 290,049.05, 435,085.37 and 138,168.05

Step by Step Solution

1. Step 1: Write the proportion equation
   290,049.05 : 435,085.37 = 138,168.05 : x
2. Step 2: Convert to fraction form
   290,049.05/435,085.37 = 138,168.05/x
3. Step 3: Cross multiply
   290,049.05x = 435,085.37 × 138,168.05
4. Step 4: Simplify right side
   290,049.05x = 60,114,894,290.16
5. Step 5: Solve for x
   x = 60,114,894,290.16/290,049.05
6. Step 6: Final answer
   x = 207,257.69