Finding the Fourth Proportional to 128,687.76, 192,978.18 and 49,756.50

Step by Step Solution

1. Step 1: Write the proportion equation
   128,687.76 : 192,978.18 = 49,756.50 : x
2. Step 2: Convert to fraction form
   128,687.76/192,978.18 = 49,756.50/x
3. Step 3: Cross multiply
   128,687.76x = 192,978.18 × 49,756.50
4. Step 4: Simplify right side
   128,687.76x = 9,601,918,813.17
5. Step 5: Solve for x
   x = 9,601,918,813.17/128,687.76
6. Step 6: Final answer
   x = 74,614.08