Finding the Fourth Proportional to 10,638.02, 15,966.23 and 10,613.40

Step by Step Solution

1. Step 1: Write the proportion equation
   10,638.02 : 15,966.23 = 10,613.40 : x
2. Step 2: Convert to fraction form
   10,638.02/15,966.23 = 10,613.40/x
3. Step 3: Cross multiply
   10,638.02x = 15,966.23 × 10,613.40
4. Step 4: Simplify right side
   10,638.02x = 169,455,932.42
5. Step 5: Solve for x
   x = 169,455,932.42/10,638.02
6. Step 6: Final answer
   x = 15,929.28