Finding the Fourth Proportional to 101,506.38, 139,985.72 and 87,161.33

Step by Step Solution

1. Step 1: Write the proportion equation
   101,506.38 : 139,985.72 = 87,161.33 : x
2. Step 2: Convert to fraction form
   101,506.38/139,985.72 = 87,161.33/x
3. Step 3: Cross multiply
   101,506.38x = 139,985.72 × 87,161.33
4. Step 4: Simplify right side
   101,506.38x = 12,201,341,404.15
5. Step 5: Solve for x
   x = 12,201,341,404.15/101,506.38
6. Step 6: Final answer
   x = 120,202.71