Finding the Fourth Proportional to 116,617.18, 160,903.20 and 65,620

Step by Step Solution

1. Step 1: Write the proportion equation
   116,617.18 : 160,903.20 = 65,620 : x
2. Step 2: Convert to fraction form
   116,617.18/160,903.20 = 65,620/x
3. Step 3: Cross multiply
   116,617.18x = 160,903.20 × 65,620
4. Step 4: Simplify right side
   116,617.18x = 10,558,467,984
5. Step 5: Solve for x
   x = 10,558,467,984/116,617.18
6. Step 6: Final answer
   x = 90,539.56