Finding the Fourth Proportional to 290,111.28, 435,188 and 121,462

Step by Step Solution

1. Step 1: Write the proportion equation
   290,111.28 : 435,188 = 121,462 : x
2. Step 2: Convert to fraction form
   290,111.28/435,188 = 121,462/x
3. Step 3: Cross multiply
   290,111.28x = 435,188 × 121,462
4. Step 4: Simplify right side
   290,111.28x = 52,858,804,856
5. Step 5: Solve for x
   x = 52,858,804,856/290,111.28
6. Step 6: Final answer
   x = 182,201.83