Finding the Fourth Proportional to 151,728.16, 209,384.72 and 84,660.16

Step by Step Solution

1. Step 1: Write the proportion equation
   151,728.16 : 209,384.72 = 84,660.16 : x
2. Step 2: Convert to fraction form
   151,728.16/209,384.72 = 84,660.16/x
3. Step 3: Cross multiply
   151,728.16x = 209,384.72 × 84,660.16
4. Step 4: Simplify right side
   151,728.16x = 17,726,543,896.76
5. Step 5: Solve for x
   x = 17,726,543,896.76/151,728.16
6. Step 6: Final answer
   x = 116,830.94