Finding the Fourth Proportional to 128,109.25, 192,280.49 and 68,188.03

Step by Step Solution

1. Step 1: Write the proportion equation
   128,109.25 : 192,280.49 = 68,188.03 : x
2. Step 2: Convert to fraction form
   128,109.25/192,280.49 = 68,188.03/x
3. Step 3: Cross multiply
   128,109.25x = 192,280.49 × 68,188.03
4. Step 4: Simplify right side
   128,109.25x = 13,111,227,820.53
5. Step 5: Solve for x
   x = 13,111,227,820.53/128,109.25
6. Step 6: Final answer
   x = 102,344.12