Finding the Fourth Proportional to 12,054.80, 18,060.94 and 10,557.31

Step by Step Solution

1. Step 1: Write the proportion equation
   12,054.80 : 18,060.94 = 10,557.31 : x
2. Step 2: Convert to fraction form
   12,054.80/18,060.94 = 10,557.31/x
3. Step 3: Cross multiply
   12,054.80x = 18,060.94 × 10,557.31
4. Step 4: Simplify right side
   12,054.80x = 190,674,942.47
5. Step 5: Solve for x
   x = 190,674,942.47/12,054.80
6. Step 6: Final answer
   x = 15,817.35