Finding the Fourth Proportional to 11,789.70, 17,666.73 and 7,887.12

Step by Step Solution

1. Step 1: Write the proportion equation
   11,789.70 : 17,666.73 = 7,887.12 : x
2. Step 2: Convert to fraction form
   11,789.70/17,666.73 = 7,887.12/x
3. Step 3: Cross multiply
   11,789.70x = 17,666.73 × 7,887.12
4. Step 4: Simplify right side
   11,789.70x = 139,339,619.52
5. Step 5: Solve for x
   x = 139,339,619.52/11,789.70
6. Step 6: Final answer
   x = 11,818.76