Finding the Fourth Proportional to 154,985.38, 213,863.31 and 87,009.86

Step by Step Solution

1. Step 1: Write the proportion equation
   154,985.38 : 213,863.31 = 87,009.86 : x
2. Step 2: Convert to fraction form
   154,985.38/213,863.31 = 87,009.86/x
3. Step 3: Cross multiply
   154,985.38x = 213,863.31 × 87,009.86
4. Step 4: Simplify right side
   154,985.38x = 18,608,217,196.89
5. Step 5: Solve for x
   x = 18,608,217,196.89/154,985.38
6. Step 6: Final answer
   x = 120,064.34