Finding the Fourth Proportional to 290,436.89, 400,840.50 and 163,112.48

Step by Step Solution

1. Step 1: Write the proportion equation
   290,436.89 : 400,840.50 = 163,112.48 : x
2. Step 2: Convert to fraction form
   290,436.89/400,840.50 = 163,112.48/x
3. Step 3: Cross multiply
   290,436.89x = 400,840.50 × 163,112.48
4. Step 4: Simplify right side
   290,436.89x = 65,382,089,487.28
5. Step 5: Solve for x
   x = 65,382,089,487.28/290,436.89
6. Step 6: Final answer
   x = 225,116.34