Finding the Fourth Proportional to 42,705.20, 63,942.60 and 42,705.20

Step by Step Solution

1. Step 1: Write the proportion equation
   42,705.20 : 63,942.60 = 42,705.20 : x
2. Step 2: Convert to fraction form
   42,705.20/63,942.60 = 42,705.20/x
3. Step 3: Cross multiply
   42,705.20x = 63,942.60 × 42,705.20
4. Step 4: Simplify right side
   42,705.20x = 2,730,681,521.52
5. Step 5: Solve for x
   x = 2,730,681,521.52/42,705.20
6. Step 6: Final answer
   x = 63,942.60