Finding the Fourth Proportional to 22,570.74, 31,148.01 and 13,139.10

Step by Step Solution

1. Step 1: Write the proportion equation
   22,570.74 : 31,148.01 = 13,139.10 : x
2. Step 2: Convert to fraction form
   22,570.74/31,148.01 = 13,139.10/x
3. Step 3: Cross multiply
   22,570.74x = 31,148.01 × 13,139.10
4. Step 4: Simplify right side
   22,570.74x = 409,256,818.19
5. Step 5: Solve for x
   x = 409,256,818.19/22,570.74
6. Step 6: Final answer
   x = 18,132.18