Finding the Fourth Proportional to 80,048.61, 120,145.61 and 42,640.58

Step by Step Solution

1. Step 1: Write the proportion equation
   80,048.61 : 120,145.61 = 42,640.58 : x
2. Step 2: Convert to fraction form
   80,048.61/120,145.61 = 42,640.58/x
3. Step 3: Cross multiply
   80,048.61x = 120,145.61 × 42,640.58
4. Step 4: Simplify right side
   80,048.61x = 5,123,078,901.82
5. Step 5: Solve for x
   x = 5,123,078,901.82/80,048.61
6. Step 6: Final answer
   x = 63,999.60