Finding the Fourth Proportional to 128,045.30, 192,061.55 and 65,722.10

Step by Step Solution

1. Step 1: Write the proportion equation
   128,045.30 : 192,061.55 = 65,722.10 : x
2. Step 2: Convert to fraction form
   128,045.30/192,061.55 = 65,722.10/x
3. Step 3: Cross multiply
   128,045.30x = 192,061.55 × 65,722.10
4. Step 4: Simplify right side
   128,045.30x = 12,622,688,395.26
5. Step 5: Solve for x
   x = 12,622,688,395.26/128,045.30
6. Step 6: Final answer
   x = 98,579.87