Finding the Fourth Proportional to 42,576.28, 63,878.10 and 12,997.10

Step by Step Solution

1. Step 1: Write the proportion equation
   42,576.28 : 63,878.10 = 12,997.10 : x
2. Step 2: Convert to fraction form
   42,576.28/63,878.10 = 12,997.10/x
3. Step 3: Cross multiply
   42,576.28x = 63,878.10 × 12,997.10
4. Step 4: Simplify right side
   42,576.28x = 830,229,988.52
5. Step 5: Solve for x
   x = 830,229,988.52/42,576.28
6. Step 6: Final answer
   x = 19,499.83