Finding the Fourth Proportional to 56,643, 85,003.50 and 19,707

Step by Step Solution

1. Step 1: Write the proportion equation
   56,643 : 85,003.50 = 19,707 : x
2. Step 2: Convert to fraction form
   56,643/85,003.50 = 19,707/x
3. Step 3: Cross multiply
   56,643x = 85,003.50 × 19,707
4. Step 4: Simplify right side
   56,643x = 1,675,163,974.50
5. Step 5: Solve for x
   x = 1,675,163,974.50/56,643
6. Step 6: Final answer
   x = 29,574.07