Finding the Fourth Proportional to 9,128.90, 13,692.62 and 2,555.30

Step by Step Solution

1. Step 1: Write the proportion equation
   9,128.90 : 13,692.62 = 2,555.30 : x
2. Step 2: Convert to fraction form
   9,128.90/13,692.62 = 2,555.30/x
3. Step 3: Cross multiply
   9,128.90x = 13,692.62 × 2,555.30
4. Step 4: Simplify right side
   9,128.90x = 34,988,751.89
5. Step 5: Solve for x
   x = 34,988,751.89/9,128.90
6. Step 6: Final answer
   x = 3,832.75