Finding the Fourth Proportional to 123,616.61, 170,570.70 and 81,227.69

Step by Step Solution

1. Step 1: Write the proportion equation
   123,616.61 : 170,570.70 = 81,227.69 : x
2. Step 2: Convert to fraction form
   123,616.61/170,570.70 = 81,227.69/x
3. Step 3: Cross multiply
   123,616.61x = 170,570.70 × 81,227.69
4. Step 4: Simplify right side
   123,616.61x = 13,855,063,135.51
5. Step 5: Solve for x
   x = 13,855,063,135.51/123,616.61
6. Step 6: Final answer
   x = 112,080.92