Finding the Fourth Proportional to 113,415, 156,502.50 and 65,671.56

Step by Step Solution

1. Step 1: Write the proportion equation
   113,415 : 156,502.50 = 65,671.56 : x
2. Step 2: Convert to fraction form
   113,415/156,502.50 = 65,671.56/x
3. Step 3: Cross multiply
   113,415x = 156,502.50 × 65,671.56
4. Step 4: Simplify right side
   113,415x = 10,277,763,318.90
5. Step 5: Solve for x
   x = 10,277,763,318.90/113,415
6. Step 6: Final answer
   x = 90,620.85