Finding the Fourth Proportional to 38,978.55, 53,790.37 and 21,073.56

Step by Step Solution

1. Step 1: Write the proportion equation
   38,978.55 : 53,790.37 = 21,073.56 : x
2. Step 2: Convert to fraction form
   38,978.55/53,790.37 = 21,073.56/x
3. Step 3: Cross multiply
   38,978.55x = 53,790.37 × 21,073.56
4. Step 4: Simplify right side
   38,978.55x = 1,133,554,589.62
5. Step 5: Solve for x
   x = 1,133,554,589.62/38,978.55
6. Step 6: Final answer
   x = 29,081.50