Finding the Fourth Proportional to 13,081, 18,051.30 and 7,112.50

Step by Step Solution

1. Step 1: Write the proportion equation
   13,081 : 18,051.30 = 7,112.50 : x
2. Step 2: Convert to fraction form
   13,081/18,051.30 = 7,112.50/x
3. Step 3: Cross multiply
   13,081x = 18,051.30 × 7,112.50
4. Step 4: Simplify right side
   13,081x = 128,389,871.25
5. Step 5: Solve for x
   x = 128,389,871.25/13,081
6. Step 6: Final answer
   x = 9,814.99