Finding the Fourth Proportional to 46,139.20, 69,111.60 and 46,139.20

Step by Step Solution

1. Step 1: Write the proportion equation
   46,139.20 : 69,111.60 = 46,139.20 : x
2. Step 2: Convert to fraction form
   46,139.20/69,111.60 = 46,139.20/x
3. Step 3: Cross multiply
   46,139.20x = 69,111.60 × 46,139.20
4. Step 4: Simplify right side
   46,139.20x = 3,188,753,934.72
5. Step 5: Solve for x
   x = 3,188,753,934.72/46,139.20
6. Step 6: Final answer
   x = 69,111.60