Finding the Fourth Proportional to 42,716.60, 64,081.56 and 20,525.84

Step by Step Solution

1. Step 1: Write the proportion equation
   42,716.60 : 64,081.56 = 20,525.84 : x
2. Step 2: Convert to fraction form
   42,716.60/64,081.56 = 20,525.84/x
3. Step 3: Cross multiply
   42,716.60x = 64,081.56 × 20,525.84
4. Step 4: Simplify right side
   42,716.60x = 1,315,327,847.51
5. Step 5: Solve for x
   x = 1,315,327,847.51/42,716.60
6. Step 6: Final answer
   x = 30,791.96