Finding the Fourth Proportional to 81,978.82, 122,985.51 and 26,570.50

Step by Step Solution

1. Step 1: Write the proportion equation
   81,978.82 : 122,985.51 = 26,570.50 : x
2. Step 2: Convert to fraction form
   81,978.82/122,985.51 = 26,570.50/x
3. Step 3: Cross multiply
   81,978.82x = 122,985.51 × 26,570.50
4. Step 4: Simplify right side
   81,978.82x = 3,267,786,493.46
5. Step 5: Solve for x
   x = 3,267,786,493.46/81,978.82
6. Step 6: Final answer
   x = 39,861.35