Finding the Fourth Proportional to 21,071.30, 31,602.68 and 7,739.72

Step by Step Solution

1. Step 1: Write the proportion equation
   21,071.30 : 31,602.68 = 7,739.72 : x
2. Step 2: Convert to fraction form
   21,071.30/31,602.68 = 7,739.72/x
3. Step 3: Cross multiply
   21,071.30x = 31,602.68 × 7,739.72
4. Step 4: Simplify right side
   21,071.30x = 244,595,894.45
5. Step 5: Solve for x
   x = 244,595,894.45/21,071.30
6. Step 6: Final answer
   x = 11,608.01