Finding the Fourth Proportional to 42,966.68, 64,461.20 and 13,385

Step by Step Solution

1. Step 1: Write the proportion equation
   42,966.68 : 64,461.20 = 13,385 : x
2. Step 2: Convert to fraction form
   42,966.68/64,461.20 = 13,385/x
3. Step 3: Cross multiply
   42,966.68x = 64,461.20 × 13,385
4. Step 4: Simplify right side
   42,966.68x = 862,813,162
5. Step 5: Solve for x
   x = 862,813,162/42,966.68
6. Step 6: Final answer
   x = 20,080.98