Finding the Fourth Proportional to 143,841.69, 215,612.84 and 80,569.05

Step by Step Solution

1. Step 1: Write the proportion equation
   143,841.69 : 215,612.84 = 80,569.05 : x
2. Step 2: Convert to fraction form
   143,841.69/215,612.84 = 80,569.05/x
3. Step 3: Cross multiply
   143,841.69x = 215,612.84 × 80,569.05
4. Step 4: Simplify right side
   143,841.69x = 17,371,721,686.60
5. Step 5: Solve for x
   x = 17,371,721,686.60/143,841.69
6. Step 6: Final answer
   x = 120,769.73