Finding the Fourth Proportional to 13,111.30, 19,638.15 and 7,908.10

Step by Step Solution

1. Step 1: Write the proportion equation
   13,111.30 : 19,638.15 = 7,908.10 : x
2. Step 2: Convert to fraction form
   13,111.30/19,638.15 = 7,908.10/x
3. Step 3: Cross multiply
   13,111.30x = 19,638.15 × 7,908.10
4. Step 4: Simplify right side
   13,111.30x = 155,300,454.02
5. Step 5: Solve for x
   x = 155,300,454.02/13,111.30
6. Step 6: Final answer
   x = 11,844.78