Finding the Fourth Proportional to 11,887.57, 16,405.41 and 7,171.75

Step by Step Solution

1. Step 1: Write the proportion equation
   11,887.57 : 16,405.41 = 7,171.75 : x
2. Step 2: Convert to fraction form
   11,887.57/16,405.41 = 7,171.75/x
3. Step 3: Cross multiply
   11,887.57x = 16,405.41 × 7,171.75
4. Step 4: Simplify right side
   11,887.57x = 117,655,499.17
5. Step 5: Solve for x
   x = 117,655,499.17/11,887.57
6. Step 6: Final answer
   x = 9,897.35