Finding the Fourth Proportional to 42,566.38, 63,858.96 and 12,986.50

Step by Step Solution

1. Step 1: Write the proportion equation
   42,566.38 : 63,858.96 = 12,986.50 : x
2. Step 2: Convert to fraction form
   42,566.38/63,858.96 = 12,986.50/x
3. Step 3: Cross multiply
   42,566.38x = 63,858.96 × 12,986.50
4. Step 4: Simplify right side
   42,566.38x = 829,304,384.04
5. Step 5: Solve for x
   x = 829,304,384.04/42,566.38
6. Step 6: Final answer
   x = 19,482.61