Finding the Fourth Proportional to 81,789.42, 122,669.90 and 26,385.42

Step by Step Solution

1. Step 1: Write the proportion equation
   81,789.42 : 122,669.90 = 26,385.42 : x
2. Step 2: Convert to fraction form
   81,789.42/122,669.90 = 26,385.42/x
3. Step 3: Cross multiply
   81,789.42x = 122,669.90 × 26,385.42
4. Step 4: Simplify right side
   81,789.42x = 3,236,696,832.86
5. Step 5: Solve for x
   x = 3,236,696,832.86/81,789.42
6. Step 6: Final answer
   x = 39,573.54