Finding the Fourth Proportional to 70,436.58, 105,672.18 and 20,517.14

Step by Step Solution

1. Step 1: Write the proportion equation
   70,436.58 : 105,672.18 = 20,517.14 : x
2. Step 2: Convert to fraction form
   70,436.58/105,672.18 = 20,517.14/x
3. Step 3: Cross multiply
   70,436.58x = 105,672.18 × 20,517.14
4. Step 4: Simplify right side
   70,436.58x = 2,168,090,911.17
5. Step 5: Solve for x
   x = 2,168,090,911.17/70,436.58
6. Step 6: Final answer
   x = 30,780.75