Finding the Fourth Proportional to 111,966.10, 156,959.90 and 111,966.10

Step by Step Solution

1. Step 1: Write the proportion equation
   111,966.10 : 156,959.90 = 111,966.10 : x
2. Step 2: Convert to fraction form
   111,966.10/156,959.90 = 111,966.10/x
3. Step 3: Cross multiply
   111,966.10x = 156,959.90 × 111,966.10
4. Step 4: Simplify right side
   111,966.10x = 17,574,187,859.39
5. Step 5: Solve for x
   x = 17,574,187,859.39/111,966.10
6. Step 6: Final answer
   x = 156,959.90