Finding the Fourth Proportional to 18,100.74, 24,978.78 and 10,143.12

Step by Step Solution

1. Step 1: Write the proportion equation
   18,100.74 : 24,978.78 = 10,143.12 : x
2. Step 2: Convert to fraction form
   18,100.74/24,978.78 = 10,143.12/x
3. Step 3: Cross multiply
   18,100.74x = 24,978.78 × 10,143.12
4. Step 4: Simplify right side
   18,100.74x = 253,362,762.99
5. Step 5: Solve for x
   x = 253,362,762.99/18,100.74
6. Step 6: Final answer
   x = 13,997.37