Finding the Fourth Proportional to 13,772.88, 19,006.47 and 7,485.30

Step by Step Solution

1. Step 1: Write the proportion equation
   13,772.88 : 19,006.47 = 7,485.30 : x
2. Step 2: Convert to fraction form
   13,772.88/19,006.47 = 7,485.30/x
3. Step 3: Cross multiply
   13,772.88x = 19,006.47 × 7,485.30
4. Step 4: Simplify right side
   13,772.88x = 142,269,129.89
5. Step 5: Solve for x
   x = 142,269,129.89/13,772.88
6. Step 6: Final answer
   x = 10,329.66