Finding the Fourth Proportional to 13,146.50, 19,719.89 and 3,912.50

Step by Step Solution

1. Step 1: Write the proportion equation
   13,146.50 : 19,719.89 = 3,912.50 : x
2. Step 2: Convert to fraction form
   13,146.50/19,719.89 = 3,912.50/x
3. Step 3: Cross multiply
   13,146.50x = 19,719.89 × 3,912.50
4. Step 4: Simplify right side
   13,146.50x = 77,154,050.06
5. Step 5: Solve for x
   x = 77,154,050.06/13,146.50
6. Step 6: Final answer
   x = 5,868.79