Finding the Fourth Proportional to 115,709.40, 159,663.02 and 64,719.50

Step by Step Solution

1. Step 1: Write the proportion equation
   115,709.40 : 159,663.02 = 64,719.50 : x
2. Step 2: Convert to fraction form
   115,709.40/159,663.02 = 64,719.50/x
3. Step 3: Cross multiply
   115,709.40x = 159,663.02 × 64,719.50
4. Step 4: Simplify right side
   115,709.40x = 10,333,310,822.89
5. Step 5: Solve for x
   x = 10,333,310,822.89/115,709.40
6. Step 6: Final answer
   x = 89,303.99