Finding the Fourth Proportional to 111,385.56, 153,768.06 and 72,640.92

Step by Step Solution

1. Step 1: Write the proportion equation
   111,385.56 : 153,768.06 = 72,640.92 : x
2. Step 2: Convert to fraction form
   111,385.56/153,768.06 = 72,640.92/x
3. Step 3: Cross multiply
   111,385.56x = 153,768.06 × 72,640.92
4. Step 4: Simplify right side
   111,385.56x = 11,169,853,345.02
5. Step 5: Solve for x
   x = 11,169,853,345.02/111,385.56
6. Step 6: Final answer
   x = 100,280.98