Finding the Fourth Proportional to 9,051.57, 13,580.15 and 3,128.58

Step by Step Solution

1. Step 1: Write the proportion equation
   9,051.57 : 13,580.15 = 3,128.58 : x
2. Step 2: Convert to fraction form
   9,051.57/13,580.15 = 3,128.58/x
3. Step 3: Cross multiply
   9,051.57x = 13,580.15 × 3,128.58
4. Step 4: Simplify right side
   9,051.57x = 42,486,570.04
5. Step 5: Solve for x
   x = 42,486,570.04/9,051.57
6. Step 6: Final answer
   x = 4,693.83