Finding the Fourth Proportional to 115,707.83, 159,684.89 and 64,725.21

Step by Step Solution

1. Step 1: Write the proportion equation
   115,707.83 : 159,684.89 = 64,725.21 : x
2. Step 2: Convert to fraction form
   115,707.83/159,684.89 = 64,725.21/x
3. Step 3: Cross multiply
   115,707.83x = 159,684.89 × 64,725.21
4. Step 4: Simplify right side
   115,707.83x = 10,335,637,715.45
5. Step 5: Solve for x
   x = 10,335,637,715.45/115,707.83
6. Step 6: Final answer
   x = 89,325.31