Finding the Fourth Proportional to 21,192.56, 31,804.72 and 7,877.84

Step by Step Solution

1. Step 1: Write the proportion equation
   21,192.56 : 31,804.72 = 7,877.84 : x
2. Step 2: Convert to fraction form
   21,192.56/31,804.72 = 7,877.84/x
3. Step 3: Cross multiply
   21,192.56x = 31,804.72 × 7,877.84
4. Step 4: Simplify right side
   21,192.56x = 250,552,495.40
5. Step 5: Solve for x
   x = 250,552,495.40/21,192.56
6. Step 6: Final answer
   x = 11,822.66