Finding the Fourth Proportional to 465,816.92, 698,686.38 and 128,861.72

Step by Step Solution

1. Step 1: Write the proportion equation
   465,816.92 : 698,686.38 = 128,861.72 : x
2. Step 2: Convert to fraction form
   465,816.92/698,686.38 = 128,861.72/x
3. Step 3: Cross multiply
   465,816.92x = 698,686.38 × 128,861.72
4. Step 4: Simplify right side
   465,816.92x = 90,033,928,667.37
5. Step 5: Solve for x
   x = 90,033,928,667.37/465,816.92
6. Step 6: Final answer
   x = 193,281.79