Finding the Fourth Proportional to 80,669.30, 121,007.91 and 21,505.50

Step by Step Solution

1. Step 1: Write the proportion equation
   80,669.30 : 121,007.91 = 21,505.50 : x
2. Step 2: Convert to fraction form
   80,669.30/121,007.91 = 21,505.50/x
3. Step 3: Cross multiply
   80,669.30x = 121,007.91 × 21,505.50
4. Step 4: Simplify right side
   80,669.30x = 2,602,335,608.51
5. Step 5: Solve for x
   x = 2,602,335,608.51/80,669.30
6. Step 6: Final answer
   x = 32,259.31