Finding the Fourth Proportional to 12,870.12, 17,760.42 and 7,281

Step by Step Solution

1. Step 1: Write the proportion equation
   12,870.12 : 17,760.42 = 7,281 : x
2. Step 2: Convert to fraction form
   12,870.12/17,760.42 = 7,281/x
3. Step 3: Cross multiply
   12,870.12x = 17,760.42 × 7,281
4. Step 4: Simplify right side
   12,870.12x = 129,313,618.02
5. Step 5: Solve for x
   x = 129,313,618.02/12,870.12
6. Step 6: Final answer
   x = 10,047.58