Finding the Fourth Proportional to 139,780.12, 209,618.34 and 75,725.56

Step by Step Solution

1. Step 1: Write the proportion equation
   139,780.12 : 209,618.34 = 75,725.56 : x
2. Step 2: Convert to fraction form
   139,780.12/209,618.34 = 75,725.56/x
3. Step 3: Cross multiply
   139,780.12x = 209,618.34 × 75,725.56
4. Step 4: Simplify right side
   139,780.12x = 15,873,466,182.77
5. Step 5: Solve for x
   x = 15,873,466,182.77/139,780.12
6. Step 6: Final answer
   x = 113,560.26