Finding the Fourth Proportional to 115,978.72, 173,672.75 and 76,415.89

Step by Step Solution

1. Step 1: Write the proportion equation
   115,978.72 : 173,672.75 = 76,415.89 : x
2. Step 2: Convert to fraction form
   115,978.72/173,672.75 = 76,415.89/x
3. Step 3: Cross multiply
   115,978.72x = 173,672.75 × 76,415.89
4. Step 4: Simplify right side
   115,978.72x = 13,271,356,509.55
5. Step 5: Solve for x
   x = 13,271,356,509.55/115,978.72
6. Step 6: Final answer
   x = 114,429.24