Finding the Fourth Proportional to 85,360.23, 128,105.69 and 38,645.91

Step by Step Solution

1. Step 1: Write the proportion equation
   85,360.23 : 128,105.69 = 38,645.91 : x
2. Step 2: Convert to fraction form
   85,360.23/128,105.69 = 38,645.91/x
3. Step 3: Cross multiply
   85,360.23x = 128,105.69 × 38,645.91
4. Step 4: Simplify right side
   85,360.23x = 4,950,760,773.00
5. Step 5: Solve for x
   x = 4,950,760,773.00/85,360.23
6. Step 6: Final answer
   x = 57,998.45