Finding the Fourth Proportional to 12,980.42, 17,891.94 and 10,142.84

Step by Step Solution

1. Step 1: Write the proportion equation
   12,980.42 : 17,891.94 = 10,142.84 : x
2. Step 2: Convert to fraction form
   12,980.42/17,891.94 = 10,142.84/x
3. Step 3: Cross multiply
   12,980.42x = 17,891.94 × 10,142.84
4. Step 4: Simplify right side
   12,980.42x = 181,475,084.71
5. Step 5: Solve for x
   x = 181,475,084.71/12,980.42
6. Step 6: Final answer
   x = 13,980.68