Finding the Fourth Proportional to 42,486.72, 63,643.20 and 20,232.72

Step by Step Solution

1. Step 1: Write the proportion equation
   42,486.72 : 63,643.20 = 20,232.72 : x
2. Step 2: Convert to fraction form
   42,486.72/63,643.20 = 20,232.72/x
3. Step 3: Cross multiply
   42,486.72x = 63,643.20 × 20,232.72
4. Step 4: Simplify right side
   42,486.72x = 1,287,675,045.50
5. Step 5: Solve for x
   x = 1,287,675,045.50/42,486.72
6. Step 6: Final answer
   x = 30,307.71