Finding the Fourth Proportional to 300,436.05, 450,624.90 and 78,820.05

Step by Step Solution

1. Step 1: Write the proportion equation
   300,436.05 : 450,624.90 = 78,820.05 : x
2. Step 2: Convert to fraction form
   300,436.05/450,624.90 = 78,820.05/x
3. Step 3: Cross multiply
   300,436.05x = 450,624.90 × 78,820.05
4. Step 4: Simplify right side
   300,436.05x = 35,518,277,149.25
5. Step 5: Solve for x
   x = 35,518,277,149.25/300,436.05
6. Step 6: Final answer
   x = 118,222.42