Finding the Fourth Proportional to 13,490.78, 18,617.28 and 7,522.32

Step by Step Solution

1. Step 1: Write the proportion equation
   13,490.78 : 18,617.28 = 7,522.32 : x
2. Step 2: Convert to fraction form
   13,490.78/18,617.28 = 7,522.32/x
3. Step 3: Cross multiply
   13,490.78x = 18,617.28 × 7,522.32
4. Step 4: Simplify right side
   13,490.78x = 140,045,137.69
5. Step 5: Solve for x
   x = 140,045,137.69/13,490.78
6. Step 6: Final answer
   x = 10,380.80