Finding the Fourth Proportional to 42,854.01, 64,307.57 and 20,669.61

Step by Step Solution

1. Step 1: Write the proportion equation
   42,854.01 : 64,307.57 = 20,669.61 : x
2. Step 2: Convert to fraction form
   42,854.01/64,307.57 = 20,669.61/x
3. Step 3: Cross multiply
   42,854.01x = 64,307.57 × 20,669.61
4. Step 4: Simplify right side
   42,854.01x = 1,329,212,391.95
5. Step 5: Solve for x
   x = 1,329,212,391.95/42,854.01
6. Step 6: Final answer
   x = 31,017.22