Finding the Fourth Proportional to 39,760.61, 54,867.98 and 21,853.94

Step by Step Solution

1. Step 1: Write the proportion equation
   39,760.61 : 54,867.98 = 21,853.94 : x
2. Step 2: Convert to fraction form
   39,760.61/54,867.98 = 21,853.94/x
3. Step 3: Cross multiply
   39,760.61x = 54,867.98 × 21,853.94
4. Step 4: Simplify right side
   39,760.61x = 1,199,081,323.14
5. Step 5: Solve for x
   x = 1,199,081,323.14/39,760.61
6. Step 6: Final answer
   x = 30,157.52