Finding the Fourth Proportional to 42,997.10, 64,466.21 and 21,896.30

Step by Step Solution

1. Step 1: Write the proportion equation
   42,997.10 : 64,466.21 = 21,896.30 : x
2. Step 2: Convert to fraction form
   42,997.10/64,466.21 = 21,896.30/x
3. Step 3: Cross multiply
   42,997.10x = 64,466.21 × 21,896.30
4. Step 4: Simplify right side
   42,997.10x = 1,411,571,042.21
5. Step 5: Solve for x
   x = 1,411,571,042.21/42,997.10
6. Step 6: Final answer
   x = 32,829.45