Finding the Fourth Proportional to 219,017.39, 328,528.71 and 85,960.31

Step by Step Solution

1. Step 1: Write the proportion equation
   219,017.39 : 328,528.71 = 85,960.31 : x
2. Step 2: Convert to fraction form
   219,017.39/328,528.71 = 85,960.31/x
3. Step 3: Cross multiply
   219,017.39x = 328,528.71 × 85,960.31
4. Step 4: Simplify right side
   219,017.39x = 28,240,428,112.86
5. Step 5: Solve for x
   x = 28,240,428,112.86/219,017.39
6. Step 6: Final answer
   x = 128,941.49