Finding the Fourth Proportional to 139,939.05, 193,116.17 and 91,574.15

Step by Step Solution

1. Step 1: Write the proportion equation
   139,939.05 : 193,116.17 = 91,574.15 : x
2. Step 2: Convert to fraction form
   139,939.05/193,116.17 = 91,574.15/x
3. Step 3: Cross multiply
   139,939.05x = 193,116.17 × 91,574.15
4. Step 4: Simplify right side
   139,939.05x = 17,684,449,830.73
5. Step 5: Solve for x
   x = 17,684,449,830.73/139,939.05
6. Step 6: Final answer
   x = 126,372.52