Finding the Fourth Proportional to 42,099.73, 63,116.49 and 21,028.90

Step by Step Solution

1. Step 1: Write the proportion equation
   42,099.73 : 63,116.49 = 21,028.90 : x
2. Step 2: Convert to fraction form
   42,099.73/63,116.49 = 21,028.90/x
3. Step 3: Cross multiply
   42,099.73x = 63,116.49 × 21,028.90
4. Step 4: Simplify right side
   42,099.73x = 1,327,270,356.56
5. Step 5: Solve for x
   x = 1,327,270,356.56/42,099.73
6. Step 6: Final answer
   x = 31,526.81