Finding the Fourth Proportional to 42,748.04, 64,025.73 and 20,578.07

Step by Step Solution

1. Step 1: Write the proportion equation
   42,748.04 : 64,025.73 = 20,578.07 : x
2. Step 2: Convert to fraction form
   42,748.04/64,025.73 = 20,578.07/x
3. Step 3: Cross multiply
   42,748.04x = 64,025.73 × 20,578.07
4. Step 4: Simplify right side
   42,748.04x = 1,317,525,953.74
5. Step 5: Solve for x
   x = 1,317,525,953.74/42,748.04
6. Step 6: Final answer
   x = 30,820.73