Finding the Fourth Proportional to 10,830.10, 15,142.70 and 10,830.10

Step by Step Solution

1. Step 1: Write the proportion equation
   10,830.10 : 15,142.70 = 10,830.10 : x
2. Step 2: Convert to fraction form
   10,830.10/15,142.70 = 10,830.10/x
3. Step 3: Cross multiply
   10,830.10x = 15,142.70 × 10,830.10
4. Step 4: Simplify right side
   10,830.10x = 163,996,955.27
5. Step 5: Solve for x
   x = 163,996,955.27/10,830.10
6. Step 6: Final answer
   x = 15,142.70