Finding the Fourth Proportional to 11,479.32, 15,841.98 and 8,991

Step by Step Solution

1. Step 1: Write the proportion equation
   11,479.32 : 15,841.98 = 8,991 : x
2. Step 2: Convert to fraction form
   11,479.32/15,841.98 = 8,991/x
3. Step 3: Cross multiply
   11,479.32x = 15,841.98 × 8,991
4. Step 4: Simplify right side
   11,479.32x = 142,435,242.18
5. Step 5: Solve for x
   x = 142,435,242.18/11,479.32
6. Step 6: Final answer
   x = 12,407.99