Finding the Fourth Proportional to 39,868.86, 55,018.71 and 21,965.82

Step by Step Solution

1. Step 1: Write the proportion equation
   39,868.86 : 55,018.71 = 21,965.82 : x
2. Step 2: Convert to fraction form
   39,868.86/55,018.71 = 21,965.82/x
3. Step 3: Cross multiply
   39,868.86x = 55,018.71 × 21,965.82
4. Step 4: Simplify right side
   39,868.86x = 1,208,531,080.49
5. Step 5: Solve for x
   x = 1,208,531,080.49/39,868.86
6. Step 6: Final answer
   x = 30,312.66