Finding the Fourth Proportional to 42,800.67, 64,166.20 and 17,859.29

Step by Step Solution

1. Step 1: Write the proportion equation
   42,800.67 : 64,166.20 = 17,859.29 : x
2. Step 2: Convert to fraction form
   42,800.67/64,166.20 = 17,859.29/x
3. Step 3: Cross multiply
   42,800.67x = 64,166.20 × 17,859.29
4. Step 4: Simplify right side
   42,800.67x = 1,145,962,774.00
5. Step 5: Solve for x
   x = 1,145,962,774.00/42,800.67
6. Step 6: Final answer
   x = 26,774.41