Finding the Fourth Proportional to 31,080, 42,890.64 and 18,504

Step by Step Solution

1. Step 1: Write the proportion equation
   31,080 : 42,890.64 = 18,504 : x
2. Step 2: Convert to fraction form
   31,080/42,890.64 = 18,504/x
3. Step 3: Cross multiply
   31,080x = 42,890.64 × 18,504
4. Step 4: Simplify right side
   31,080x = 793,648,402.56
5. Step 5: Solve for x
   x = 793,648,402.56/31,080
6. Step 6: Final answer
   x = 25,535.66