Finding the Fourth Proportional to 70,508.18, 105,772.16 and 20,591.98

Step by Step Solution

1. Step 1: Write the proportion equation
   70,508.18 : 105,772.16 = 20,591.98 : x
2. Step 2: Convert to fraction form
   70,508.18/105,772.16 = 20,591.98/x
3. Step 3: Cross multiply
   70,508.18x = 105,772.16 × 20,591.98
4. Step 4: Simplify right side
   70,508.18x = 2,178,057,990.33
5. Step 5: Solve for x
   x = 2,178,057,990.33/70,508.18
6. Step 6: Final answer
   x = 30,890.85