Finding the Fourth Proportional to 8,965.72, 12,373.50 and 5,428.72

Step by Step Solution

1. Step 1: Write the proportion equation
   8,965.72 : 12,373.50 = 5,428.72 : x
2. Step 2: Convert to fraction form
   8,965.72/12,373.50 = 5,428.72/x
3. Step 3: Cross multiply
   8,965.72x = 12,373.50 × 5,428.72
4. Step 4: Simplify right side
   8,965.72x = 67,172,266.92
5. Step 5: Solve for x
   x = 67,172,266.92/8,965.72
6. Step 6: Final answer
   x = 7,492.12