Finding the Fourth Proportional to 113,721.70, 156,943.30 and 65,991.10

Step by Step Solution

1. Step 1: Write the proportion equation
   113,721.70 : 156,943.30 = 65,991.10 : x
2. Step 2: Convert to fraction form
   113,721.70/156,943.30 = 65,991.10/x
3. Step 3: Cross multiply
   113,721.70x = 156,943.30 × 65,991.10
4. Step 4: Simplify right side
   113,721.70x = 10,356,861,004.63
5. Step 5: Solve for x
   x = 10,356,861,004.63/113,721.70
6. Step 6: Final answer
   x = 91,071.99