Finding the Fourth Proportional to 11,886.48, 16,410.60 and 7,911

Step by Step Solution

1. Step 1: Write the proportion equation
   11,886.48 : 16,410.60 = 7,911 : x
2. Step 2: Convert to fraction form
   11,886.48/16,410.60 = 7,911/x
3. Step 3: Cross multiply
   11,886.48x = 16,410.60 × 7,911
4. Step 4: Simplify right side
   11,886.48x = 129,824,256.60
5. Step 5: Solve for x
   x = 129,824,256.60/11,886.48
6. Step 6: Final answer
   x = 10,922.01