Finding the Fourth Proportional to 111,711.60, 156,603.60 and 111,711.60

Step by Step Solution

1. Step 1: Write the proportion equation
   111,711.60 : 156,603.60 = 111,711.60 : x
2. Step 2: Convert to fraction form
   111,711.60/156,603.60 = 111,711.60/x
3. Step 3: Cross multiply
   111,711.60x = 156,603.60 × 111,711.60
4. Step 4: Simplify right side
   111,711.60x = 17,494,438,721.76
5. Step 5: Solve for x
   x = 17,494,438,721.76/111,711.60
6. Step 6: Final answer
   x = 156,603.60