Finding the Fourth Proportional to 115,785.89, 159,787.38 and 64,798.21

Step by Step Solution

1. Step 1: Write the proportion equation
   115,785.89 : 159,787.38 = 64,798.21 : x
2. Step 2: Convert to fraction form
   115,785.89/159,787.38 = 64,798.21/x
3. Step 3: Cross multiply
   115,785.89x = 159,787.38 × 64,798.21
4. Step 4: Simplify right side
   115,785.89x = 10,353,936,647.32
5. Step 5: Solve for x
   x = 10,353,936,647.32/115,785.89
6. Step 6: Final answer
   x = 89,423.13