Finding the Fourth Proportional to 53,978.84, 80,965.12 and 20,697.56

Step by Step Solution

1. Step 1: Write the proportion equation
   53,978.84 : 80,965.12 = 20,697.56 : x
2. Step 2: Convert to fraction form
   53,978.84/80,965.12 = 20,697.56/x
3. Step 3: Cross multiply
   53,978.84x = 80,965.12 × 20,697.56
4. Step 4: Simplify right side
   53,978.84x = 1,675,780,429.11
5. Step 5: Solve for x
   x = 1,675,780,429.11/53,978.84
6. Step 6: Final answer
   x = 31,045.14