Finding the Fourth Proportional to 13,580.42, 18,740.72 and 7,612.60

Step by Step Solution

1. Step 1: Write the proportion equation
   13,580.42 : 18,740.72 = 7,612.60 : x
2. Step 2: Convert to fraction form
   13,580.42/18,740.72 = 7,612.60/x
3. Step 3: Cross multiply
   13,580.42x = 18,740.72 × 7,612.60
4. Step 4: Simplify right side
   13,580.42x = 142,665,605.07
5. Step 5: Solve for x
   x = 142,665,605.07/13,580.42
6. Step 6: Final answer
   x = 10,505.24