Finding the Fourth Proportional to 200,430.72, 300,503.52 and 100,518.72

Step by Step Solution

1. Step 1: Write the proportion equation
   200,430.72 : 300,503.52 = 100,518.72 : x
2. Step 2: Convert to fraction form
   200,430.72/300,503.52 = 100,518.72/x
3. Step 3: Cross multiply
   200,430.72x = 300,503.52 × 100,518.72
4. Step 4: Simplify right side
   200,430.72x = 30,206,229,185.89
5. Step 5: Solve for x
   x = 30,206,229,185.89/200,430.72
6. Step 6: Final answer
   x = 150,706.58