Finding the Fourth Proportional to 70,649.91, 105,975.45 and 20,730.82

Step by Step Solution

1. Step 1: Write the proportion equation
   70,649.91 : 105,975.45 = 20,730.82 : x
2. Step 2: Convert to fraction form
   70,649.91/105,975.45 = 20,730.82/x
3. Step 3: Cross multiply
   70,649.91x = 105,975.45 × 20,730.82
4. Step 4: Simplify right side
   70,649.91x = 2,196,957,978.37
5. Step 5: Solve for x
   x = 2,196,957,978.37/70,649.91
6. Step 6: Final answer
   x = 31,096.40