Finding the Fourth Proportional to 115,978.34, 173,672.18 and 76,415.51

Step by Step Solution

1. Step 1: Write the proportion equation
   115,978.34 : 173,672.18 = 76,415.51 : x
2. Step 2: Convert to fraction form
   115,978.34/173,672.18 = 76,415.51/x
3. Step 3: Cross multiply
   115,978.34x = 173,672.18 × 76,415.51
4. Step 4: Simplify right side
   115,978.34x = 13,271,248,832.73
5. Step 5: Solve for x
   x = 13,271,248,832.73/115,978.34
6. Step 6: Final answer
   x = 114,428.68