Finding the Fourth Proportional to 86,642.41, 129,667.91 and 72,618.27

Step by Step Solution

1. Step 1: Write the proportion equation
   86,642.41 : 129,667.91 = 72,618.27 : x
2. Step 2: Convert to fraction form
   86,642.41/129,667.91 = 72,618.27/x
3. Step 3: Cross multiply
   86,642.41x = 129,667.91 × 72,618.27
4. Step 4: Simplify right side
   86,642.41x = 9,416,258,287.28
5. Step 5: Solve for x
   x = 9,416,258,287.28/86,642.41
6. Step 6: Final answer
   x = 108,679.56