Finding the Fourth Proportional to 37,665.12, 56,519.28 and 13,989.12

Step by Step Solution

1. Step 1: Write the proportion equation
   37,665.12 : 56,519.28 = 13,989.12 : x
2. Step 2: Convert to fraction form
   37,665.12/56,519.28 = 13,989.12/x
3. Step 3: Cross multiply
   37,665.12x = 56,519.28 × 13,989.12
4. Step 4: Simplify right side
   37,665.12x = 790,654,990.23
5. Step 5: Solve for x
   x = 790,654,990.23/37,665.12
6. Step 6: Final answer
   x = 20,991.70