Finding the Fourth Proportional to 213,749.52, 320,520.72 and 87,339.57

Step by Step Solution

1. Step 1: Write the proportion equation
   213,749.52 : 320,520.72 = 87,339.57 : x
2. Step 2: Convert to fraction form
   213,749.52/320,520.72 = 87,339.57/x
3. Step 3: Cross multiply
   213,749.52x = 320,520.72 × 87,339.57
4. Step 4: Simplify right side
   213,749.52x = 27,994,141,860.89
5. Step 5: Solve for x
   x = 27,994,141,860.89/213,749.52
6. Step 6: Final answer
   x = 130,967.04