Finding the Fourth Proportional to 290,083.55, 435,124.04 and 90,404.10

Step by Step Solution

1. Step 1: Write the proportion equation
   290,083.55 : 435,124.04 = 90,404.10 : x
2. Step 2: Convert to fraction form
   290,083.55/435,124.04 = 90,404.10/x
3. Step 3: Cross multiply
   290,083.55x = 435,124.04 × 90,404.10
4. Step 4: Simplify right side
   290,083.55x = 39,336,996,772.54
5. Step 5: Solve for x
   x = 39,336,996,772.54/290,083.55
6. Step 6: Final answer
   x = 135,605.75