Finding the Fourth Proportional to 66,443.06, 99,647.58 and 19,685

Step by Step Solution

1. Step 1: Write the proportion equation
   66,443.06 : 99,647.58 = 19,685 : x
2. Step 2: Convert to fraction form
   66,443.06/99,647.58 = 19,685/x
3. Step 3: Cross multiply
   66,443.06x = 99,647.58 × 19,685
4. Step 4: Simplify right side
   66,443.06x = 1,961,562,612.30
5. Step 5: Solve for x
   x = 1,961,562,612.30/66,443.06
6. Step 6: Final answer
   x = 29,522.46