Finding the Fourth Proportional to 39,886.47, 55,043.05 and 21,981.49

Step by Step Solution

1. Step 1: Write the proportion equation
   39,886.47 : 55,043.05 = 21,981.49 : x
2. Step 2: Convert to fraction form
   39,886.47/55,043.05 = 21,981.49/x
3. Step 3: Cross multiply
   39,886.47x = 55,043.05 × 21,981.49
4. Step 4: Simplify right side
   39,886.47x = 1,209,927,991.78
5. Step 5: Solve for x
   x = 1,209,927,991.78/39,886.47
6. Step 6: Final answer
   x = 30,334.30