Finding the Fourth Proportional to 137,443.49, 189,644.89 and 86,426.58

Step by Step Solution

1. Step 1: Write the proportion equation
   137,443.49 : 189,644.89 = 86,426.58 : x
2. Step 2: Convert to fraction form
   137,443.49/189,644.89 = 86,426.58/x
3. Step 3: Cross multiply
   137,443.49x = 189,644.89 × 86,426.58
4. Step 4: Simplify right side
   137,443.49x = 16,390,359,257.18
5. Step 5: Solve for x
   x = 16,390,359,257.18/137,443.49
6. Step 6: Final answer
   x = 119,251.62