Finding the Fourth Proportional to 113,381.31, 156,472.67 and 64,991.29

Step by Step Solution

1. Step 1: Write the proportion equation
   113,381.31 : 156,472.67 = 64,991.29 : x
2. Step 2: Convert to fraction form
   113,381.31/156,472.67 = 64,991.29/x
3. Step 3: Cross multiply
   113,381.31x = 156,472.67 × 64,991.29
4. Step 4: Simplify right side
   113,381.31x = 10,169,360,673.04
5. Step 5: Solve for x
   x = 10,169,360,673.04/113,381.31
6. Step 6: Final answer
   x = 89,691.68