Finding the Fourth Proportional to 154,713.57, 213,504.72 and 87,645.57

Step by Step Solution

1. Step 1: Write the proportion equation
   154,713.57 : 213,504.72 = 87,645.57 : x
2. Step 2: Convert to fraction form
   154,713.57/213,504.72 = 87,645.57/x
3. Step 3: Cross multiply
   154,713.57x = 213,504.72 × 87,645.57
4. Step 4: Simplify right side
   154,713.57x = 18,712,742,882.09
5. Step 5: Solve for x
   x = 18,712,742,882.09/154,713.57
6. Step 6: Final answer
   x = 120,950.88