Finding the Fourth Proportional to 13,139.83, 18,132.96 and 7,474.56

Step by Step Solution

1. Step 1: Write the proportion equation
   13,139.83 : 18,132.96 = 7,474.56 : x
2. Step 2: Convert to fraction form
   13,139.83/18,132.96 = 7,474.56/x
3. Step 3: Cross multiply
   13,139.83x = 18,132.96 × 7,474.56
4. Step 4: Simplify right side
   13,139.83x = 135,535,897.50
5. Step 5: Solve for x
   x = 135,535,897.50/13,139.83
6. Step 6: Final answer
   x = 10,314.89