Finding the Fourth Proportional to 113,156.72, 156,138.93 and 65,400.86

Step by Step Solution

1. Step 1: Write the proportion equation
   113,156.72 : 156,138.93 = 65,400.86 : x
2. Step 2: Convert to fraction form
   113,156.72/156,138.93 = 65,400.86/x
3. Step 3: Cross multiply
   113,156.72x = 156,138.93 × 65,400.86
4. Step 4: Simplify right side
   113,156.72x = 10,211,620,301.48
5. Step 5: Solve for x
   x = 10,211,620,301.48/113,156.72
6. Step 6: Final answer
   x = 90,243.16