Finding the Fourth Proportional to 105,781.55, 145,978.61 and 58,037.51

Step by Step Solution

1. Step 1: Write the proportion equation
   105,781.55 : 145,978.61 = 58,037.51 : x
2. Step 2: Convert to fraction form
   105,781.55/145,978.61 = 58,037.51/x
3. Step 3: Cross multiply
   105,781.55x = 145,978.61 × 58,037.51
4. Step 4: Simplify right side
   105,781.55x = 8,472,235,112.42
5. Step 5: Solve for x
   x = 8,472,235,112.42/105,781.55
6. Step 6: Final answer
   x = 80,091.81