Finding the Fourth Proportional to 123,441.57, 170,378.10 and 87,642.81

Step by Step Solution

1. Step 1: Write the proportion equation
   123,441.57 : 170,378.10 = 87,642.81 : x
2. Step 2: Convert to fraction form
   123,441.57/170,378.10 = 87,642.81/x
3. Step 3: Cross multiply
   123,441.57x = 170,378.10 × 87,642.81
4. Step 4: Simplify right side
   123,441.57x = 14,932,415,446.46
5. Step 5: Solve for x
   x = 14,932,415,446.46/123,441.57
6. Step 6: Final answer
   x = 120,967.48