Finding the Fourth Proportional to 139,649.43, 192,690.71 and 91,238.48

Step by Step Solution

1. Step 1: Write the proportion equation
   139,649.43 : 192,690.71 = 91,238.48 : x
2. Step 2: Convert to fraction form
   139,649.43/192,690.71 = 91,238.48/x
3. Step 3: Cross multiply
   139,649.43x = 192,690.71 × 91,238.48
4. Step 4: Simplify right side
   139,649.43x = 17,580,806,070.87
5. Step 5: Solve for x
   x = 17,580,806,070.87/139,649.43
6. Step 6: Final answer
   x = 125,892.43