Finding the Fourth Proportional to 103,608.30, 142,978.02 and 58,286.28

Step by Step Solution

1. Step 1: Write the proportion equation
   103,608.30 : 142,978.02 = 58,286.28 : x
2. Step 2: Convert to fraction form
   103,608.30/142,978.02 = 58,286.28/x
3. Step 3: Cross multiply
   103,608.30x = 142,978.02 × 58,286.28
4. Step 4: Simplify right side
   103,608.30x = 8,333,656,907.57
5. Step 5: Solve for x
   x = 8,333,656,907.57/103,608.30
6. Step 6: Final answer
   x = 80,434.26