Finding the Fourth Proportional to 42,859.10, 64,297.83 and 21,802.07

Step by Step Solution

1. Step 1: Write the proportion equation
   42,859.10 : 64,297.83 = 21,802.07 : x
2. Step 2: Convert to fraction form
   42,859.10/64,297.83 = 21,802.07/x
3. Step 3: Cross multiply
   42,859.10x = 64,297.83 × 21,802.07
4. Step 4: Simplify right side
   42,859.10x = 1,401,825,790.51
5. Step 5: Solve for x
   x = 1,401,825,790.51/42,859.10
6. Step 6: Final answer
   x = 32,707.77