Finding the Fourth Proportional to 296,662.20, 445,005.60 and 86,300.15

Step by Step Solution

1. Step 1: Write the proportion equation
   296,662.20 : 445,005.60 = 86,300.15 : x
2. Step 2: Convert to fraction form
   296,662.20/445,005.60 = 86,300.15/x
3. Step 3: Cross multiply
   296,662.20x = 445,005.60 × 86,300.15
4. Step 4: Simplify right side
   296,662.20x = 38,404,047,805.81
5. Step 5: Solve for x
   x = 38,404,047,805.81/296,662.20
6. Step 6: Final answer
   x = 129,453.80