Finding the Fourth Proportional to 139,875.78, 209,564.90 and 80,588.94

Step by Step Solution

1. Step 1: Write the proportion equation
   139,875.78 : 209,564.90 = 80,588.94 : x
2. Step 2: Convert to fraction form
   139,875.78/209,564.90 = 80,588.94/x
3. Step 3: Cross multiply
   139,875.78x = 209,564.90 × 80,588.94
4. Step 4: Simplify right side
   139,875.78x = 16,888,613,152.21
5. Step 5: Solve for x
   x = 16,888,613,152.21/139,875.78
6. Step 6: Final answer
   x = 120,740.08