Finding the Fourth Proportional to 10,120.15, 15,180.15 and 7,784.31

Step by Step Solution

1. Step 1: Write the proportion equation
   10,120.15 : 15,180.15 = 7,784.31 : x
2. Step 2: Convert to fraction form
   10,120.15/15,180.15 = 7,784.31/x
3. Step 3: Cross multiply
   10,120.15x = 15,180.15 × 7,784.31
4. Step 4: Simplify right side
   10,120.15x = 118,166,993.45
5. Step 5: Solve for x
   x = 118,166,993.45/10,120.15
6. Step 6: Final answer
   x = 11,676.41