Finding the Fourth Proportional to 42,882.84, 64,339.38 and 13,308.12

Step by Step Solution

1. Step 1: Write the proportion equation
   42,882.84 : 64,339.38 = 13,308.12 : x
2. Step 2: Convert to fraction form
   42,882.84/64,339.38 = 13,308.12/x
3. Step 3: Cross multiply
   42,882.84x = 64,339.38 × 13,308.12
4. Step 4: Simplify right side
   42,882.84x = 856,236,189.77
5. Step 5: Solve for x
   x = 856,236,189.77/42,882.84
6. Step 6: Final answer
   x = 19,966.87