Finding the Fourth Proportional to 42,098.70, 63,147.50 and 12,113.72

Step by Step Solution

1. Step 1: Write the proportion equation
   42,098.70 : 63,147.50 = 12,113.72 : x
2. Step 2: Convert to fraction form
   42,098.70/63,147.50 = 12,113.72/x
3. Step 3: Cross multiply
   42,098.70x = 63,147.50 × 12,113.72
4. Step 4: Simplify right side
   42,098.70x = 764,951,133.70
5. Step 5: Solve for x
   x = 764,951,133.70/42,098.70
6. Step 6: Final answer
   x = 18,170.42