Finding the Fourth Proportional to 13,353.97, 18,429.86 and 7,688.93

Step by Step Solution

1. Step 1: Write the proportion equation
   13,353.97 : 18,429.86 = 7,688.93 : x
2. Step 2: Convert to fraction form
   13,353.97/18,429.86 = 7,688.93/x
3. Step 3: Cross multiply
   13,353.97x = 18,429.86 × 7,688.93
4. Step 4: Simplify right side
   13,353.97x = 141,705,903.45
5. Step 5: Solve for x
   x = 141,705,903.45/13,353.97
6. Step 6: Final answer
   x = 10,611.52