Finding the Fourth Proportional to 52,728.31, 79,086.61 and 13,285.42

Step by Step Solution

1. Step 1: Write the proportion equation
   52,728.31 : 79,086.61 = 13,285.42 : x
2. Step 2: Convert to fraction form
   52,728.31/79,086.61 = 13,285.42/x
3. Step 3: Cross multiply
   52,728.31x = 79,086.61 × 13,285.42
4. Step 4: Simplify right side
   52,728.31x = 1,050,698,368.37
5. Step 5: Solve for x
   x = 1,050,698,368.37/52,728.31
6. Step 6: Final answer
   x = 19,926.65