Finding the Fourth Proportional to 290,098.89, 400,233.83 and 189,555.21

Step by Step Solution

1. Step 1: Write the proportion equation
   290,098.89 : 400,233.83 = 189,555.21 : x
2. Step 2: Convert to fraction form
   290,098.89/400,233.83 = 189,555.21/x
3. Step 3: Cross multiply
   290,098.89x = 400,233.83 × 189,555.21
4. Step 4: Simplify right side
   290,098.89x = 75,866,406,746.98
5. Step 5: Solve for x
   x = 75,866,406,746.98/290,098.89
6. Step 6: Final answer
   x = 261,519.12