Finding the Fourth Proportional to 290,091.59, 435,158.34 and 121,442.30

Step by Step Solution

1. Step 1: Write the proportion equation
   290,091.59 : 435,158.34 = 121,442.30 : x
2. Step 2: Convert to fraction form
   290,091.59/435,158.34 = 121,442.30/x
3. Step 3: Cross multiply
   290,091.59x = 435,158.34 × 121,442.30
4. Step 4: Simplify right side
   290,091.59x = 52,846,626,890.78
5. Step 5: Solve for x
   x = 52,846,626,890.78/290,091.59
6. Step 6: Final answer
   x = 182,172.22