Finding the Fourth Proportional to 13,772.18, 19,005 and 7,803.72

Step by Step Solution

1. Step 1: Write the proportion equation
   13,772.18 : 19,005 = 7,803.72 : x
2. Step 2: Convert to fraction form
   13,772.18/19,005 = 7,803.72/x
3. Step 3: Cross multiply
   13,772.18x = 19,005 × 7,803.72
4. Step 4: Simplify right side
   13,772.18x = 148,309,698.60
5. Step 5: Solve for x
   x = 148,309,698.60/13,772.18
6. Step 6: Final answer
   x = 10,768.79