Finding the Fourth Proportional to 300,072, 450,112.32 and 78,456

Step by Step Solution

1. Step 1: Write the proportion equation
   300,072 : 450,112.32 = 78,456 : x
2. Step 2: Convert to fraction form
   300,072/450,112.32 = 78,456/x
3. Step 3: Cross multiply
   300,072x = 450,112.32 × 78,456
4. Step 4: Simplify right side
   300,072x = 35,314,012,177.92
5. Step 5: Solve for x
   x = 35,314,012,177.92/300,072
6. Step 6: Final answer
   x = 117,685.13