Finding the Fourth Proportional to 151,728.86, 209,469.72 and 91,314.35

Step by Step Solution

1. Step 1: Write the proportion equation
   151,728.86 : 209,469.72 = 91,314.35 : x
2. Step 2: Convert to fraction form
   151,728.86/209,469.72 = 91,314.35/x
3. Step 3: Cross multiply
   151,728.86x = 209,469.72 × 91,314.35
4. Step 4: Simplify right side
   151,728.86x = 19,127,589,822.56
5. Step 5: Solve for x
   x = 19,127,589,822.56/151,728.86
6. Step 6: Final answer
   x = 126,064.29