Finding the Fourth Proportional to 10,085.58, 15,128.78 and 3,512.43

Step by Step Solution

1. Step 1: Write the proportion equation
   10,085.58 : 15,128.78 = 3,512.43 : x
2. Step 2: Convert to fraction form
   10,085.58/15,128.78 = 3,512.43/x
3. Step 3: Cross multiply
   10,085.58x = 15,128.78 × 3,512.43
4. Step 4: Simplify right side
   10,085.58x = 53,138,763.17
5. Step 5: Solve for x
   x = 53,138,763.17/10,085.58
6. Step 6: Final answer
   x = 5,268.79