Finding the Fourth Proportional to 13,056.61, 18,030.14 and 12,357.47

Step by Step Solution

1. Step 1: Write the proportion equation
   13,056.61 : 18,030.14 = 12,357.47 : x
2. Step 2: Convert to fraction form
   13,056.61/18,030.14 = 12,357.47/x
3. Step 3: Cross multiply
   13,056.61x = 18,030.14 × 12,357.47
4. Step 4: Simplify right side
   13,056.61x = 222,806,914.15
5. Step 5: Solve for x
   x = 222,806,914.15/13,056.61
6. Step 6: Final answer
   x = 17,064.68