Finding the Fourth Proportional to 18,870.72, 26,014.14 and 13,187.82

Step by Step Solution

1. Step 1: Write the proportion equation
   18,870.72 : 26,014.14 = 13,187.82 : x
2. Step 2: Convert to fraction form
   18,870.72/26,014.14 = 13,187.82/x
3. Step 3: Cross multiply
   18,870.72x = 26,014.14 × 13,187.82
4. Step 4: Simplify right side
   18,870.72x = 343,069,795.77
5. Step 5: Solve for x
   x = 343,069,795.77/18,870.72
6. Step 6: Final answer
   x = 18,180.01