Finding the Fourth Proportional to 140,708.74, 194,139.56 and 90,436.90

Step by Step Solution

1. Step 1: Write the proportion equation
   140,708.74 : 194,139.56 = 90,436.90 : x
2. Step 2: Convert to fraction form
   140,708.74/194,139.56 = 90,436.90/x
3. Step 3: Cross multiply
   140,708.74x = 194,139.56 × 90,436.90
4. Step 4: Simplify right side
   140,708.74x = 17,557,379,973.76
5. Step 5: Solve for x
   x = 17,557,379,973.76/140,708.74
6. Step 6: Final answer
   x = 124,778.18