Finding the Fourth Proportional to 290,302.32, 400,616.91 and 162,978.15

Step by Step Solution

1. Step 1: Write the proportion equation
   290,302.32 : 400,616.91 = 162,978.15 : x
2. Step 2: Convert to fraction form
   290,302.32/400,616.91 = 162,978.15/x
3. Step 3: Cross multiply
   290,302.32x = 400,616.91 × 162,978.15
4. Step 4: Simplify right side
   290,302.32x = 65,291,802,850.52
5. Step 5: Solve for x
   x = 65,291,802,850.52/290,302.32
6. Step 6: Final answer
   x = 224,909.68