Finding the Fourth Proportional to 12,085.60, 18,128.58 and 7,435.39

Step by Step Solution

1. Step 1: Write the proportion equation
   12,085.60 : 18,128.58 = 7,435.39 : x
2. Step 2: Convert to fraction form
   12,085.60/18,128.58 = 7,435.39/x
3. Step 3: Cross multiply
   12,085.60x = 18,128.58 × 7,435.39
4. Step 4: Simplify right side
   12,085.60x = 134,793,062.45
5. Step 5: Solve for x
   x = 134,793,062.45/12,085.60
6. Step 6: Final answer
   x = 11,153.20