Finding the Fourth Proportional to 113,142.68, 156,119.56 and 65,386.81

Step by Step Solution

1. Step 1: Write the proportion equation
   113,142.68 : 156,119.56 = 65,386.81 : x
2. Step 2: Convert to fraction form
   113,142.68/156,119.56 = 65,386.81/x
3. Step 3: Cross multiply
   113,142.68x = 156,119.56 × 65,386.81
4. Step 4: Simplify right side
   113,142.68x = 10,208,160,454.01
5. Step 5: Solve for x
   x = 10,208,160,454.01/113,142.68
6. Step 6: Final answer
   x = 90,223.78