Finding the Fourth Proportional to 131,490, 181,456.20 and 71,874

Step by Step Solution

1. Step 1: Write the proportion equation
   131,490 : 181,456.20 = 71,874 : x
2. Step 2: Convert to fraction form
   131,490/181,456.20 = 71,874/x
3. Step 3: Cross multiply
   131,490x = 181,456.20 × 71,874
4. Step 4: Simplify right side
   131,490x = 13,041,982,918.80
5. Step 5: Solve for x
   x = 13,041,982,918.80/131,490
6. Step 6: Final answer
   x = 99,186.12