Finding the Fourth Proportional to 11,689.74, 16,123.32 and 7,211.86

Step by Step Solution

1. Step 1: Write the proportion equation
   11,689.74 : 16,123.32 = 7,211.86 : x
2. Step 2: Convert to fraction form
   11,689.74/16,123.32 = 7,211.86/x
3. Step 3: Cross multiply
   11,689.74x = 16,123.32 × 7,211.86
4. Step 4: Simplify right side
   11,689.74x = 116,279,086.27
5. Step 5: Solve for x
   x = 116,279,086.27/11,689.74
6. Step 6: Final answer
   x = 9,947.11