Finding the Fourth Proportional to 89,914.24, 124,128.28 and 65,688

Step by Step Solution

1. Step 1: Write the proportion equation
   89,914.24 : 124,128.28 = 65,688 : x
2. Step 2: Convert to fraction form
   89,914.24/124,128.28 = 65,688/x
3. Step 3: Cross multiply
   89,914.24x = 124,128.28 × 65,688
4. Step 4: Simplify right side
   89,914.24x = 8,153,738,456.64
5. Step 5: Solve for x
   x = 8,153,738,456.64/89,914.24
6. Step 6: Final answer
   x = 90,683.51