Finding the Fourth Proportional to 13,490.31, 18,616.72 and 7,522.36

Step by Step Solution

1. Step 1: Write the proportion equation
   13,490.31 : 18,616.72 = 7,522.36 : x
2. Step 2: Convert to fraction form
   13,490.31/18,616.72 = 7,522.36/x
3. Step 3: Cross multiply
   13,490.31x = 18,616.72 × 7,522.36
4. Step 4: Simplify right side
   13,490.31x = 140,041,669.86
5. Step 5: Solve for x
   x = 140,041,669.86/13,490.31
6. Step 6: Final answer
   x = 10,380.91