Finding the Fourth Proportional to 105,683.47, 145,858.20 and 65,410.21

Step by Step Solution

1. Step 1: Write the proportion equation
   105,683.47 : 145,858.20 = 65,410.21 : x
2. Step 2: Convert to fraction form
   105,683.47/145,858.20 = 65,410.21/x
3. Step 3: Cross multiply
   105,683.47x = 145,858.20 × 65,410.21
4. Step 4: Simplify right side
   105,683.47x = 9,540,615,492.22
5. Step 5: Solve for x
   x = 9,540,615,492.22/105,683.47
6. Step 6: Final answer
   x = 90,275.38