Finding the Fourth Proportional to 21,070.30, 31,601.18 and 7,738.72

Step by Step Solution

1. Step 1: Write the proportion equation
   21,070.30 : 31,601.18 = 7,738.72 : x
2. Step 2: Convert to fraction form
   21,070.30/31,601.18 = 7,738.72/x
3. Step 3: Cross multiply
   21,070.30x = 31,601.18 × 7,738.72
4. Step 4: Simplify right side
   21,070.30x = 244,552,683.69
5. Step 5: Solve for x
   x = 244,552,683.69/21,070.30
6. Step 6: Final answer
   x = 11,606.51