Finding the Fourth Proportional to 115,787.39, 159,789.45 and 64,799.72

Step by Step Solution

1. Step 1: Write the proportion equation
   115,787.39 : 159,789.45 = 64,799.72 : x
2. Step 2: Convert to fraction form
   115,787.39/159,789.45 = 64,799.72/x
3. Step 3: Cross multiply
   115,787.39x = 159,789.45 × 64,799.72
4. Step 4: Simplify right side
   115,787.39x = 10,354,310,820.01
5. Step 5: Solve for x
   x = 10,354,310,820.01/115,787.39
6. Step 6: Final answer
   x = 89,425.21