Finding the Fourth Proportional to 42,858.10, 64,296.33 and 21,801.07

Step by Step Solution

1. Step 1: Write the proportion equation
   42,858.10 : 64,296.33 = 21,801.07 : x
2. Step 2: Convert to fraction form
   42,858.10/64,296.33 = 21,801.07/x
3. Step 3: Cross multiply
   42,858.10x = 64,296.33 × 21,801.07
4. Step 4: Simplify right side
   42,858.10x = 1,401,728,791.07
5. Step 5: Solve for x
   x = 1,401,728,791.07/42,858.10
6. Step 6: Final answer
   x = 32,706.27