Finding the Fourth Proportional to 123,347.80, 172,337 and 123,347.80

Step by Step Solution

1. Step 1: Write the proportion equation
   123,347.80 : 172,337 = 123,347.80 : x
2. Step 2: Convert to fraction form
   123,347.80/172,337 = 123,347.80/x
3. Step 3: Cross multiply
   123,347.80x = 172,337 × 123,347.80
4. Step 4: Simplify right side
   123,347.80x = 21,257,389,808.60
5. Step 5: Solve for x
   x = 21,257,389,808.60/123,347.80
6. Step 6: Final answer
   x = 172,337