Finding the Fourth Proportional to 70,968.35, 106,434.37 and 21,036.78

Step by Step Solution

1. Step 1: Write the proportion equation
   70,968.35 : 106,434.37 = 21,036.78 : x
2. Step 2: Convert to fraction form
   70,968.35/106,434.37 = 21,036.78/x
3. Step 3: Cross multiply
   70,968.35x = 106,434.37 × 21,036.78
4. Step 4: Simplify right side
   70,968.35x = 2,239,036,452.42
5. Step 5: Solve for x
   x = 2,239,036,452.42/70,968.35
6. Step 6: Final answer
   x = 31,549.79