Finding the Fourth Proportional to 12,870.12, 17,760.48 and 7,281.12

Step by Step Solution

1. Step 1: Write the proportion equation
   12,870.12 : 17,760.48 = 7,281.12 : x
2. Step 2: Convert to fraction form
   12,870.12/17,760.48 = 7,281.12/x
3. Step 3: Cross multiply
   12,870.12x = 17,760.48 × 7,281.12
4. Step 4: Simplify right side
   12,870.12x = 129,316,186.14
5. Step 5: Solve for x
   x = 129,316,186.14/12,870.12
6. Step 6: Final answer
   x = 10,047.78