Finding the Fourth Proportional to 300,216.07, 450,378.66 and 142,443.05

Step by Step Solution

1. Step 1: Write the proportion equation
   300,216.07 : 450,378.66 = 142,443.05 : x
2. Step 2: Convert to fraction form
   300,216.07/450,378.66 = 142,443.05/x
3. Step 3: Cross multiply
   300,216.07x = 450,378.66 × 142,443.05
4. Step 4: Simplify right side
   300,216.07x = 64,153,309,985.31
5. Step 5: Solve for x
   x = 64,153,309,985.31/300,216.07
6. Step 6: Final answer
   x = 213,690.46