Finding the Fourth Proportional to 170,811, 256,371.98 and 90,916.04

Step by Step Solution

1. Step 1: Write the proportion equation
   170,811 : 256,371.98 = 90,916.04 : x
2. Step 2: Convert to fraction form
   170,811/256,371.98 = 90,916.04/x
3. Step 3: Cross multiply
   170,811x = 256,371.98 × 90,916.04
4. Step 4: Simplify right side
   170,811x = 23,308,325,188.56
5. Step 5: Solve for x
   x = 23,308,325,188.56/170,811
6. Step 6: Final answer
   x = 136,456.82