Finding the Fourth Proportional to 70,591.42, 105,891.27 and 19,986.22

Step by Step Solution

1. Step 1: Write the proportion equation
   70,591.42 : 105,891.27 = 19,986.22 : x
2. Step 2: Convert to fraction form
   70,591.42/105,891.27 = 19,986.22/x
3. Step 3: Cross multiply
   70,591.42x = 105,891.27 × 19,986.22
4. Step 4: Simplify right side
   70,591.42x = 2,116,366,218.30
5. Step 5: Solve for x
   x = 2,116,366,218.30/70,591.42
6. Step 6: Final answer
   x = 29,980.50