Finding the Fourth Proportional to 123,591.58, 170,465.79 and 81,134.62

Step by Step Solution

1. Step 1: Write the proportion equation
   123,591.58 : 170,465.79 = 81,134.62 : x
2. Step 2: Convert to fraction form
   123,591.58/170,465.79 = 81,134.62/x
3. Step 3: Cross multiply
   123,591.58x = 170,465.79 × 81,134.62
4. Step 4: Simplify right side
   123,591.58x = 13,830,677,094.65
5. Step 5: Solve for x
   x = 13,830,677,094.65/123,591.58
6. Step 6: Final answer
   x = 111,906.31