Finding the Fourth Proportional to 8,330.78, 12,492.50 and 3,133

Step by Step Solution

1. Step 1: Write the proportion equation
   8,330.78 : 12,492.50 = 3,133 : x
2. Step 2: Convert to fraction form
   8,330.78/12,492.50 = 3,133/x
3. Step 3: Cross multiply
   8,330.78x = 12,492.50 × 3,133
4. Step 4: Simplify right side
   8,330.78x = 39,139,002.50
5. Step 5: Solve for x
   x = 39,139,002.50/8,330.78
6. Step 6: Final answer
   x = 4,698.12