Finding the Fourth Proportional to 42,406.10, 63,479.55 and 42,406.10

Step by Step Solution

1. Step 1: Write the proportion equation
   42,406.10 : 63,479.55 = 42,406.10 : x
2. Step 2: Convert to fraction form
   42,406.10/63,479.55 = 42,406.10/x
3. Step 3: Cross multiply
   42,406.10x = 63,479.55 × 42,406.10
4. Step 4: Simplify right side
   42,406.10x = 2,691,920,145.26
5. Step 5: Solve for x
   x = 2,691,920,145.26/42,406.10
6. Step 6: Final answer
   x = 63,479.55