Finding the Fourth Proportional to 21,002.30, 31,492.51 and 9,906.01

Step by Step Solution

1. Step 1: Write the proportion equation
   21,002.30 : 31,492.51 = 9,906.01 : x
2. Step 2: Convert to fraction form
   21,002.30/31,492.51 = 9,906.01/x
3. Step 3: Cross multiply
   21,002.30x = 31,492.51 × 9,906.01
4. Step 4: Simplify right side
   21,002.30x = 311,964,961.52
5. Step 5: Solve for x
   x = 311,964,961.52/21,002.30
6. Step 6: Final answer
   x = 14,853.85