Finding the Fourth Proportional to 123,451, 170,315.40 and 91,262.90

Step by Step Solution

1. Step 1: Write the proportion equation
   123,451 : 170,315.40 = 91,262.90 : x
2. Step 2: Convert to fraction form
   123,451/170,315.40 = 91,262.90/x
3. Step 3: Cross multiply
   123,451x = 170,315.40 × 91,262.90
4. Step 4: Simplify right side
   123,451x = 15,543,477,318.66
5. Step 5: Solve for x
   x = 15,543,477,318.66/123,451
6. Step 6: Final answer
   x = 125,908.07