Finding the Fourth Proportional to 12,619.72, 17,410.98 and 7,902.28

Step by Step Solution

1. Step 1: Write the proportion equation
   12,619.72 : 17,410.98 = 7,902.28 : x
2. Step 2: Convert to fraction form
   12,619.72/17,410.98 = 7,902.28/x
3. Step 3: Cross multiply
   12,619.72x = 17,410.98 × 7,902.28
4. Step 4: Simplify right side
   12,619.72x = 137,586,439.03
5. Step 5: Solve for x
   x = 137,586,439.03/12,619.72
6. Step 6: Final answer
   x = 10,902.50