Finding the Fourth Proportional to 105,671, 145,840.90 and 65,397.74

Step by Step Solution

1. Step 1: Write the proportion equation
   105,671 : 145,840.90 = 65,397.74 : x
2. Step 2: Convert to fraction form
   105,671/145,840.90 = 65,397.74/x
3. Step 3: Cross multiply
   105,671x = 145,840.90 × 65,397.74
4. Step 4: Simplify right side
   105,671x = 9,537,665,259.57
5. Step 5: Solve for x
   x = 9,537,665,259.57/105,671
6. Step 6: Final answer
   x = 90,258.11