Finding the Fourth Proportional to 12,131.64, 18,201.90 and 5,113.41

Step by Step Solution

1. Step 1: Write the proportion equation
   12,131.64 : 18,201.90 = 5,113.41 : x
2. Step 2: Convert to fraction form
   12,131.64/18,201.90 = 5,113.41/x
3. Step 3: Cross multiply
   12,131.64x = 18,201.90 × 5,113.41
4. Step 4: Simplify right side
   12,131.64x = 93,073,777.48
5. Step 5: Solve for x
   x = 93,073,777.48/12,131.64
6. Step 6: Final answer
   x = 7,671.99