Finding the Fourth Proportional to 128,061.34, 176,747.78 and 76,381.74

Step by Step Solution

1. Step 1: Write the proportion equation
   128,061.34 : 176,747.78 = 76,381.74 : x
2. Step 2: Convert to fraction form
   128,061.34/176,747.78 = 76,381.74/x
3. Step 3: Cross multiply
   128,061.34x = 176,747.78 × 76,381.74
4. Step 4: Simplify right side
   128,061.34x = 13,500,302,977.54
5. Step 5: Solve for x
   x = 13,500,302,977.54/128,061.34
6. Step 6: Final answer
   x = 105,420.60