Finding the Fourth Proportional to 123,891.86, 170,997.99 and 81,454.34

Step by Step Solution

1. Step 1: Write the proportion equation
   123,891.86 : 170,997.99 = 81,454.34 : x
2. Step 2: Convert to fraction form
   123,891.86/170,997.99 = 81,454.34/x
3. Step 3: Cross multiply
   123,891.86x = 170,997.99 × 81,454.34
4. Step 4: Simplify right side
   123,891.86x = 13,928,528,538.82
5. Step 5: Solve for x
   x = 13,928,528,538.82/123,891.86
6. Step 6: Final answer
   x = 112,424.89