Finding the Fourth Proportional to 215,706.78, 323,448.12 and 65,916.72

Step by Step Solution

1. Step 1: Write the proportion equation
   215,706.78 : 323,448.12 = 65,916.72 : x
2. Step 2: Convert to fraction form
   215,706.78/323,448.12 = 65,916.72/x
3. Step 3: Cross multiply
   215,706.78x = 323,448.12 × 65,916.72
4. Step 4: Simplify right side
   215,706.78x = 21,320,639,160.57
5. Step 5: Solve for x
   x = 21,320,639,160.57/215,706.78
6. Step 6: Final answer
   x = 98,840.84