Finding the Fourth Proportional to 128,737.76, 177,667.78 and 75,011.37

Step by Step Solution

1. Step 1: Write the proportion equation
   128,737.76 : 177,667.78 = 75,011.37 : x
2. Step 2: Convert to fraction form
   128,737.76/177,667.78 = 75,011.37/x
3. Step 3: Cross multiply
   128,737.76x = 177,667.78 × 75,011.37
4. Step 4: Simplify right side
   128,737.76x = 13,327,102,869.52
5. Step 5: Solve for x
   x = 13,327,102,869.52/128,737.76
6. Step 6: Final answer
   x = 103,521.32