Finding the Fourth Proportional to 109,417.25, 150,991.41 and 61,680.50

Step by Step Solution

1. Step 1: Write the proportion equation
   109,417.25 : 150,991.41 = 61,680.50 : x
2. Step 2: Convert to fraction form
   109,417.25/150,991.41 = 61,680.50/x
3. Step 3: Cross multiply
   109,417.25x = 150,991.41 × 61,680.50
4. Step 4: Simplify right side
   109,417.25x = 9,313,224,909.55
5. Step 5: Solve for x
   x = 9,313,224,909.55/109,417.25
6. Step 6: Final answer
   x = 85,116.61