Finding the Fourth Proportional to 111,937.60, 156,920 and 111,937.60

Step by Step Solution

1. Step 1: Write the proportion equation
   111,937.60 : 156,920 = 111,937.60 : x
2. Step 2: Convert to fraction form
   111,937.60/156,920 = 111,937.60/x
3. Step 3: Cross multiply
   111,937.60x = 156,920 × 111,937.60
4. Step 4: Simplify right side
   111,937.60x = 17,565,248,192
5. Step 5: Solve for x
   x = 17,565,248,192/111,937.60
6. Step 6: Final answer
   x = 156,920