Finding the Fourth Proportional to 70,480.77, 105,724.71 and 20,564.61

Step by Step Solution

1. Step 1: Write the proportion equation
   70,480.77 : 105,724.71 = 20,564.61 : x
2. Step 2: Convert to fraction form
   70,480.77/105,724.71 = 20,564.61/x
3. Step 3: Cross multiply
   70,480.77x = 105,724.71 × 20,564.61
4. Step 4: Simplify right side
   70,480.77x = 2,174,187,428.51
5. Step 5: Solve for x
   x = 2,174,187,428.51/70,480.77
6. Step 6: Final answer
   x = 30,847.95