Finding the Fourth Proportional to 13,520.12, 18,662.22 and 7,931

Step by Step Solution

1. Step 1: Write the proportion equation
   13,520.12 : 18,662.22 = 7,931 : x
2. Step 2: Convert to fraction form
   13,520.12/18,662.22 = 7,931/x
3. Step 3: Cross multiply
   13,520.12x = 18,662.22 × 7,931
4. Step 4: Simplify right side
   13,520.12x = 148,010,066.82
5. Step 5: Solve for x
   x = 148,010,066.82/13,520.12
6. Step 6: Final answer
   x = 10,947.39