Finding the Fourth Proportional to 42,870.16, 64,308.57 and 12,882.06

Step by Step Solution

1. Step 1: Write the proportion equation
   42,870.16 : 64,308.57 = 12,882.06 : x
2. Step 2: Convert to fraction form
   42,870.16/64,308.57 = 12,882.06/x
3. Step 3: Cross multiply
   42,870.16x = 64,308.57 × 12,882.06
4. Step 4: Simplify right side
   42,870.16x = 828,426,935.68
5. Step 5: Solve for x
   x = 828,426,935.68/42,870.16
6. Step 6: Final answer
   x = 19,324.09