Finding the Fourth Proportional to 13,065.98, 18,026.70 and 7,400.15

Step by Step Solution

1. Step 1: Write the proportion equation
   13,065.98 : 18,026.70 = 7,400.15 : x
2. Step 2: Convert to fraction form
   13,065.98/18,026.70 = 7,400.15/x
3. Step 3: Cross multiply
   13,065.98x = 18,026.70 × 7,400.15
4. Step 4: Simplify right side
   13,065.98x = 133,400,284.01
5. Step 5: Solve for x
   x = 133,400,284.01/13,065.98
6. Step 6: Final answer
   x = 10,209.74