Finding the Fourth Proportional to 86,972.82, 130,358.43 and 40,128.18

Step by Step Solution

1. Step 1: Write the proportion equation
   86,972.82 : 130,358.43 = 40,128.18 : x
2. Step 2: Convert to fraction form
   86,972.82/130,358.43 = 40,128.18/x
3. Step 3: Cross multiply
   86,972.82x = 130,358.43 × 40,128.18
4. Step 4: Simplify right side
   86,972.82x = 5,231,046,543.56
5. Step 5: Solve for x
   x = 5,231,046,543.56/86,972.82
6. Step 6: Final answer
   x = 60,145.76