Finding the Fourth Proportional to 111,987.10, 156,989.30 and 111,987.10

Step by Step Solution

1. Step 1: Write the proportion equation
   111,987.10 : 156,989.30 = 111,987.10 : x
2. Step 2: Convert to fraction form
   111,987.10/156,989.30 = 111,987.10/x
3. Step 3: Cross multiply
   111,987.10x = 156,989.30 × 111,987.10
4. Step 4: Simplify right side
   111,987.10x = 17,580,776,438.03
5. Step 5: Solve for x
   x = 17,580,776,438.03/111,987.10
6. Step 6: Final answer
   x = 156,989.30