Finding the Fourth Proportional to 21,064.21, 31,580.72 and 9,957.93

Step by Step Solution

1. Step 1: Write the proportion equation
   21,064.21 : 31,580.72 = 9,957.93 : x
2. Step 2: Convert to fraction form
   21,064.21/31,580.72 = 9,957.93/x
3. Step 3: Cross multiply
   21,064.21x = 31,580.72 × 9,957.93
4. Step 4: Simplify right side
   21,064.21x = 314,478,599.11
5. Step 5: Solve for x
   x = 314,478,599.11/21,064.21
6. Step 6: Final answer
   x = 14,929.52