Finding the Fourth Proportional to 8,128.88, 12,172.65 and 7,380.03

Step by Step Solution

1. Step 1: Write the proportion equation
   8,128.88 : 12,172.65 = 7,380.03 : x
2. Step 2: Convert to fraction form
   8,128.88/12,172.65 = 7,380.03/x
3. Step 3: Cross multiply
   8,128.88x = 12,172.65 × 7,380.03
4. Step 4: Simplify right side
   8,128.88x = 89,834,522.18
5. Step 5: Solve for x
   x = 89,834,522.18/8,128.88
6. Step 6: Final answer
   x = 11,051.29