Finding the Fourth Proportional to 12,085.02, 18,128.40 and 5,057.96

Step by Step Solution

1. Step 1: Write the proportion equation
   12,085.02 : 18,128.40 = 5,057.96 : x
2. Step 2: Convert to fraction form
   12,085.02/18,128.40 = 5,057.96/x
3. Step 3: Cross multiply
   12,085.02x = 18,128.40 × 5,057.96
4. Step 4: Simplify right side
   12,085.02x = 91,692,767.39
5. Step 5: Solve for x
   x = 91,692,767.39/12,085.02
6. Step 6: Final answer
   x = 7,587.31