Finding the Fourth Proportional to 12,300.80, 17,801.60 and 12,300.80

Step by Step Solution

1. Step 1: Write the proportion equation
   12,300.80 : 17,801.60 = 12,300.80 : x
2. Step 2: Convert to fraction form
   12,300.80/17,801.60 = 12,300.80/x
3. Step 3: Cross multiply
   12,300.80x = 17,801.60 × 12,300.80
4. Step 4: Simplify right side
   12,300.80x = 218,973,921.28
5. Step 5: Solve for x
   x = 218,973,921.28/12,300.80
6. Step 6: Final answer
   x = 17,801.60