Finding the Fourth Proportional to 215,420.59, 323,178.89 and 65,672.57

Step by Step Solution

1. Step 1: Write the proportion equation
   215,420.59 : 323,178.89 = 65,672.57 : x
2. Step 2: Convert to fraction form
   215,420.59/323,178.89 = 65,672.57/x
3. Step 3: Cross multiply
   215,420.59x = 323,178.89 × 65,672.57
4. Step 4: Simplify right side
   215,420.59x = 21,223,988,940.34
5. Step 5: Solve for x
   x = 21,223,988,940.34/215,420.59
6. Step 6: Final answer
   x = 98,523.49