Finding the Fourth Proportional to 105,276.78, 145,279.56 and 57,530.42

Step by Step Solution

1. Step 1: Write the proportion equation
   105,276.78 : 145,279.56 = 57,530.42 : x
2. Step 2: Convert to fraction form
   105,276.78/145,279.56 = 57,530.42/x
3. Step 3: Cross multiply
   105,276.78x = 145,279.56 × 57,530.42
4. Step 4: Simplify right side
   105,276.78x = 8,357,993,377.82
5. Step 5: Solve for x
   x = 8,357,993,377.82/105,276.78
6. Step 6: Final answer
   x = 79,390.66