Finding the Fourth Proportional to 139,320, 192,259.90 and 75,658.25

Step by Step Solution

1. Step 1: Write the proportion equation
   139,320 : 192,259.90 = 75,658.25 : x
2. Step 2: Convert to fraction form
   139,320/192,259.90 = 75,658.25/x
3. Step 3: Cross multiply
   139,320x = 192,259.90 × 75,658.25
4. Step 4: Simplify right side
   139,320x = 14,546,047,870.68
5. Step 5: Solve for x
   x = 14,546,047,870.68/139,320
6. Step 6: Final answer
   x = 104,407.46