Finding the Fourth Proportional to 22,748.40, 31,392.72 and 13,315.08

Step by Step Solution

1. Step 1: Write the proportion equation
   22,748.40 : 31,392.72 = 13,315.08 : x
2. Step 2: Convert to fraction form
   22,748.40/31,392.72 = 13,315.08/x
3. Step 3: Cross multiply
   22,748.40x = 31,392.72 × 13,315.08
4. Step 4: Simplify right side
   22,748.40x = 417,996,578.22
5. Step 5: Solve for x
   x = 417,996,578.22/22,748.40
6. Step 6: Final answer
   x = 18,374.77