Finding the Fourth Proportional to 31,145.16, 42,975.18 and 18,409.08

Step by Step Solution

1. Step 1: Write the proportion equation
   31,145.16 : 42,975.18 = 18,409.08 : x
2. Step 2: Convert to fraction form
   31,145.16/42,975.18 = 18,409.08/x
3. Step 3: Cross multiply
   31,145.16x = 42,975.18 × 18,409.08
4. Step 4: Simplify right side
   31,145.16x = 791,133,526.63
5. Step 5: Solve for x
   x = 791,133,526.63/31,145.16
6. Step 6: Final answer
   x = 25,401.49