Finding the Fourth Proportional to 13,412.49, 18,510.39 and 7,445.31

Step by Step Solution

1. Step 1: Write the proportion equation
   13,412.49 : 18,510.39 = 7,445.31 : x
2. Step 2: Convert to fraction form
   13,412.49/18,510.39 = 7,445.31/x
3. Step 3: Cross multiply
   13,412.49x = 18,510.39 × 7,445.31
4. Step 4: Simplify right side
   13,412.49x = 137,815,591.77
5. Step 5: Solve for x
   x = 137,815,591.77/13,412.49
6. Step 6: Final answer
   x = 10,275.17