Finding the Fourth Proportional to 123,091.14, 185,022.15 and 81,240.21

Step by Step Solution

1. Step 1: Write the proportion equation
   123,091.14 : 185,022.15 = 81,240.21 : x
2. Step 2: Convert to fraction form
   123,091.14/185,022.15 = 81,240.21/x
3. Step 3: Cross multiply
   123,091.14x = 185,022.15 × 81,240.21
4. Step 4: Simplify right side
   123,091.14x = 15,031,238,320.65
5. Step 5: Solve for x
   x = 15,031,238,320.65/123,091.14
6. Step 6: Final answer
   x = 122,114.71