Finding the Fourth Proportional to 13,345.89, 18,419.17 and 7,680.53

Step by Step Solution

1. Step 1: Write the proportion equation
   13,345.89 : 18,419.17 = 7,680.53 : x
2. Step 2: Convert to fraction form
   13,345.89/18,419.17 = 7,680.53/x
3. Step 3: Cross multiply
   13,345.89x = 18,419.17 × 7,680.53
4. Step 4: Simplify right side
   13,345.89x = 141,468,857.26
5. Step 5: Solve for x
   x = 141,468,857.26/13,345.89
6. Step 6: Final answer
   x = 10,600.18