Finding the Fourth Proportional to 42,406.60, 63,480.30 and 42,406.60

Step by Step Solution

1. Step 1: Write the proportion equation
   42,406.60 : 63,480.30 = 42,406.60 : x
2. Step 2: Convert to fraction form
   42,406.60/63,480.30 = 42,406.60/x
3. Step 3: Cross multiply
   42,406.60x = 63,480.30 × 42,406.60
4. Step 4: Simplify right side
   42,406.60x = 2,691,983,689.98
5. Step 5: Solve for x
   x = 2,691,983,689.98/42,406.60
6. Step 6: Final answer
   x = 63,480.30