Finding the Fourth Proportional to 12,101.50, 16,661.88 and 10,994.20

Step by Step Solution

1. Step 1: Write the proportion equation
   12,101.50 : 16,661.88 = 10,994.20 : x
2. Step 2: Convert to fraction form
   12,101.50/16,661.88 = 10,994.20/x
3. Step 3: Cross multiply
   12,101.50x = 16,661.88 × 10,994.20
4. Step 4: Simplify right side
   12,101.50x = 183,184,041.10
5. Step 5: Solve for x
   x = 183,184,041.10/12,101.50
6. Step 6: Final answer
   x = 15,137.30