Finding the Fourth Proportional to 13,410.32, 18,502.71 and 9,111.02

Step by Step Solution

1. Step 1: Write the proportion equation
   13,410.32 : 18,502.71 = 9,111.02 : x
2. Step 2: Convert to fraction form
   13,410.32/18,502.71 = 9,111.02/x
3. Step 3: Cross multiply
   13,410.32x = 18,502.71 × 9,111.02
4. Step 4: Simplify right side
   13,410.32x = 168,578,560.86
5. Step 5: Solve for x
   x = 168,578,560.86/13,410.32
6. Step 6: Final answer
   x = 12,570.81