Finding the Fourth Proportional to 21,094.74, 31,617.63 and 7,938.72

Step by Step Solution

1. Step 1: Write the proportion equation
   21,094.74 : 31,617.63 = 7,938.72 : x
2. Step 2: Convert to fraction form
   21,094.74/31,617.63 = 7,938.72/x
3. Step 3: Cross multiply
   21,094.74x = 31,617.63 × 7,938.72
4. Step 4: Simplify right side
   21,094.74x = 251,003,511.63
5. Step 5: Solve for x
   x = 251,003,511.63/21,094.74
6. Step 6: Final answer
   x = 11,898.87