Finding the Fourth Proportional to 21,779.76, 30,055.16 and 12,348.12

Step by Step Solution

1. Step 1: Write the proportion equation
   21,779.76 : 30,055.16 = 12,348.12 : x
2. Step 2: Convert to fraction form
   21,779.76/30,055.16 = 12,348.12/x
3. Step 3: Cross multiply
   21,779.76x = 30,055.16 × 12,348.12
4. Step 4: Simplify right side
   21,779.76x = 371,124,722.30
5. Step 5: Solve for x
   x = 371,124,722.30/21,779.76
6. Step 6: Final answer
   x = 17,039.89