Finding the Fourth Proportional to 185,920.98, 256,498.52 and 137,638.48

Step by Step Solution

1. Step 1: Write the proportion equation
   185,920.98 : 256,498.52 = 137,638.48 : x
2. Step 2: Convert to fraction form
   185,920.98/256,498.52 = 137,638.48/x
3. Step 3: Cross multiply
   185,920.98x = 256,498.52 × 137,638.48
4. Step 4: Simplify right side
   185,920.98x = 35,304,065,085.61
5. Step 5: Solve for x
   x = 35,304,065,085.61/185,920.98
6. Step 6: Final answer
   x = 189,887.47