Finding the Fourth Proportional to 42,874.14, 64,308.72 and 12,887.73

Step by Step Solution

1. Step 1: Write the proportion equation
   42,874.14 : 64,308.72 = 12,887.73 : x
2. Step 2: Convert to fraction form
   42,874.14/64,308.72 = 12,887.73/x
3. Step 3: Cross multiply
   42,874.14x = 64,308.72 × 12,887.73
4. Step 4: Simplify right side
   42,874.14x = 828,793,420.01
5. Step 5: Solve for x
   x = 828,793,420.01/42,874.14
6. Step 6: Final answer
   x = 19,330.85