Finding the Fourth Proportional to 139,370, 192,410.40 and 91,761.76

Step by Step Solution

1. Step 1: Write the proportion equation
   139,370 : 192,410.40 = 91,761.76 : x
2. Step 2: Convert to fraction form
   139,370/192,410.40 = 91,761.76/x
3. Step 3: Cross multiply
   139,370x = 192,410.40 × 91,761.76
4. Step 4: Simplify right side
   139,370x = 17,655,916,946.30
5. Step 5: Solve for x
   x = 17,655,916,946.30/139,370
6. Step 6: Final answer
   x = 126,683.77