Finding the Fourth Proportional to 105,890.22, 146,128.66 and 58,146.60

Step by Step Solution

1. Step 1: Write the proportion equation
   105,890.22 : 146,128.66 = 58,146.60 : x
2. Step 2: Convert to fraction form
   105,890.22/146,128.66 = 58,146.60/x
3. Step 3: Cross multiply
   105,890.22x = 146,128.66 × 58,146.60
4. Step 4: Simplify right side
   105,890.22x = 8,496,884,741.56
5. Step 5: Solve for x
   x = 8,496,884,741.56/105,890.22
6. Step 6: Final answer
   x = 80,242.39