Finding the Fourth Proportional to 31,080.48, 42,894.14 and 18,980.28

Step by Step Solution

1. Step 1: Write the proportion equation
   31,080.48 : 42,894.14 = 18,980.28 : x
2. Step 2: Convert to fraction form
   31,080.48/42,894.14 = 18,980.28/x
3. Step 3: Cross multiply
   31,080.48x = 42,894.14 × 18,980.28
4. Step 4: Simplify right side
   31,080.48x = 814,142,787.56
5. Step 5: Solve for x
   x = 814,142,787.56/31,080.48
6. Step 6: Final answer
   x = 26,194.67