Finding the Fourth Proportional to 300,188.40, 450,282.52 and 142,330.72

Step by Step Solution

1. Step 1: Write the proportion equation
   300,188.40 : 450,282.52 = 142,330.72 : x
2. Step 2: Convert to fraction form
   300,188.40/450,282.52 = 142,330.72/x
3. Step 3: Cross multiply
   300,188.40x = 450,282.52 × 142,330.72
4. Step 4: Simplify right side
   300,188.40x = 64,089,035,275.01
5. Step 5: Solve for x
   x = 64,089,035,275.01/300,188.40
6. Step 6: Final answer
   x = 213,496.04