Finding the Fourth Proportional to 70,467.99, 105,690.72 and 20,536.40

Step by Step Solution

1. Step 1: Write the proportion equation
   70,467.99 : 105,690.72 = 20,536.40 : x
2. Step 2: Convert to fraction form
   70,467.99/105,690.72 = 20,536.40/x
3. Step 3: Cross multiply
   70,467.99x = 105,690.72 × 20,536.40
4. Step 4: Simplify right side
   70,467.99x = 2,170,507,243.45
5. Step 5: Solve for x
   x = 2,170,507,243.45/70,467.99
6. Step 6: Final answer
   x = 30,801.32