Finding the Fourth Proportional to 12,345.78, 17,014.68 and 10,912.08

Step by Step Solution

1. Step 1: Write the proportion equation
   12,345.78 : 17,014.68 = 10,912.08 : x
2. Step 2: Convert to fraction form
   12,345.78/17,014.68 = 10,912.08/x
3. Step 3: Cross multiply
   12,345.78x = 17,014.68 × 10,912.08
4. Step 4: Simplify right side
   12,345.78x = 185,665,549.33
5. Step 5: Solve for x
   x = 185,665,549.33/12,345.78
6. Step 6: Final answer
   x = 15,038.79