Finding the Fourth Proportional to 42,961.98, 64,463.48 and 20,763.03

Step by Step Solution

1. Step 1: Write the proportion equation
   42,961.98 : 64,463.48 = 20,763.03 : x
2. Step 2: Convert to fraction form
   42,961.98/64,463.48 = 20,763.03/x
3. Step 3: Cross multiply
   42,961.98x = 64,463.48 × 20,763.03
4. Step 4: Simplify right side
   42,961.98x = 1,338,457,065.33
5. Step 5: Solve for x
   x = 1,338,457,065.33/42,961.98
6. Step 6: Final answer
   x = 31,154.45