Finding the Fourth Proportional to 8,075.80, 12,111.30 and 3,142.60

Step by Step Solution

1. Step 1: Write the proportion equation
   8,075.80 : 12,111.30 = 3,142.60 : x
2. Step 2: Convert to fraction form
   8,075.80/12,111.30 = 3,142.60/x
3. Step 3: Cross multiply
   8,075.80x = 12,111.30 × 3,142.60
4. Step 4: Simplify right side
   8,075.80x = 38,060,971.38
5. Step 5: Solve for x
   x = 38,060,971.38/8,075.80
6. Step 6: Final answer
   x = 4,712.97