Finding the Fourth Proportional to 11,665.73, 16,090.49 and 7,188.05

Step by Step Solution

1. Step 1: Write the proportion equation
   11,665.73 : 16,090.49 = 7,188.05 : x
2. Step 2: Convert to fraction form
   11,665.73/16,090.49 = 7,188.05/x
3. Step 3: Cross multiply
   11,665.73x = 16,090.49 × 7,188.05
4. Step 4: Simplify right side
   11,665.73x = 115,659,130.25
5. Step 5: Solve for x
   x = 115,659,130.25/11,665.73
6. Step 6: Final answer
   x = 9,914.44