Finding the Fourth Proportional to 139,875.28, 209,564.16 and 80,588.46

Step by Step Solution

1. Step 1: Write the proportion equation
   139,875.28 : 209,564.16 = 80,588.46 : x
2. Step 2: Convert to fraction form
   139,875.28/209,564.16 = 80,588.46/x
3. Step 3: Cross multiply
   139,875.28x = 209,564.16 × 80,588.46
4. Step 4: Simplify right side
   139,875.28x = 16,888,452,925.59
5. Step 5: Solve for x
   x = 16,888,452,925.59/139,875.28
6. Step 6: Final answer
   x = 120,739.37